Geometry - Khan Academy

1

Euclid as the Father of Geometry

math_man | 05/13/15
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Language and Notation of Basic Geometry

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Lines, Line Segments, and Rays

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Angle Basics

MRHowley | 09/24/13
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Language and Notation of the Circle

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Measuring Angles in Degrees

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Using a Protractor

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Measuring Angles

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Complementary and Supplementary Angles

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Angles at the intersection of two lines

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Proof-Vertical Angles are Equal

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Angles Formed by Parallel Lines and Transversals...

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Proof - Sum of Measures of Angles in a Triangle ar...

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Triangle Angle Example 1

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Triangle Angle Example 2

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Triangle Angle Example 3

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Challenging Triangle Angle Problem

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Proof - Corresponding Angle Equivalence Implies Pa...

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Finding more angles

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Sum of Interior Angles of a Polygon

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Congruent Triangles and SSS

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SSS to Show a Radius is Perpendicular to a Chord t...

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Other Triangle Congruence Postulates

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Two column proof showing segments are perpendicula...

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Sum of the exterior angles of convex polygon...

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Finding Congruent Triangles

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More on why SSA is not a postulate

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Congruent Triangle Proof Example

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Congruent Triangle Example 2

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Congruent legs and base angles of Isosceles Triang...

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Equilateral Triangle Sides and Angles Congruent...

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Equilateral and Isosceles Example Problems...

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Another Isosceles Example Problem

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Example involving an isosceles triangle and parall...

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Figuring out all the angles for congruent triangle...

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Perimeter and Area Basics

math_man | 05/13/15
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Triangle Area Proofs

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Interesting Perimeter and Area Problems

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Koch Snowflake Fractal

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Area of an Equilateral Triangle

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Area of Koch Snowflake (part 1) - Advanced...

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Area of Koch Snowflake (part 2) - Advanced...

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Challenging Perimeter Problem

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Similar Triangle Basics

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Similarity Postulates

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Similar Triangle Example Problems

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Similarity Example Problems

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Challenging Similarity Problem

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Similarity example where same side plays different...

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Finding Area Using Similarity and Congruence...

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Pythagorean Theorem Proof Using Similarity...

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30-60-90 Triangle Side Ratios Proof

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45-45-90 Triangle Side Ratios

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30-60-90 Triangle Example Problem

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The Golden Ratio

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Introduction to angles (old)

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Angles (part 2)

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Angles (part 3)

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Angles formed between transversals and parallel li...

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Angles of parallel lines 2

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The Angle Game

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Similar triangles

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Similar triangles (part 2)

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Angle Game (part 2)

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Acute Right and Obtuse Angles

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Area and Perimeter

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Circles: Radius, Diameter and Circumference...

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Area of a circle

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The Pythagorean Theorem

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Pythagorean Theorem II

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45-45-90 Triangles

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Intro to 30-60-90 Triangles

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30-60-90 Triangles II

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Solid Geometry Volume

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Cylinder Volume and Surface Area

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Heron's Formula

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Part 1 of Proof of Heron's Formula

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Part 2 of the Proof of Heron's Formula

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Inscribed and Central Angles

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Area of Inscribed Equilateral Triangle (some basic...

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Right Triangles Inscribed in Circles (Proof)...

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Area of Diagonal Generated Triangles of Rectangle ...

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Triangle Medians and Centroids

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Triangle Medians and Centroids (2D Proof)...

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Rhombus Diagonals

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2003 AIME II Problem 7

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1 2003 AIME II Problem 7 submitted by math_man
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1

Perpendicular Radius Bisects Chord

math_man | 05/13/15
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1 Perpendicular Radius Bisects Chord submitted by math_man
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1

Circumcenter of a Triangle

math_man | 05/13/15
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1 Circumcenter of a Triangle submitted by math_man
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1

Circumcenter of a Right Triangle

math_man | 05/13/15
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1 Circumcenter of a Right Triangle submitted by math_man
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1

Three Points Defining a Circle

math_man | 05/13/15
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1 Three Points Defining a Circle submitted by math_man
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1

Point Line Distance and Angle Bisectors

math_man | 05/13/15
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1 Point Line Distance and Angle Bisectors submitted by math_man
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1

Incenter and incircles of a triangle

math_man | 05/13/15
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1 Incenter and incircles of a triangle submitted by math_man
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1

Angle Bisector Theorem Proof

math_man | 05/13/15
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1 Angle Bisector Theorem Proof submitted by math_man
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1

Inradius Perimeter and Area

math_man | 05/13/15
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1 Inradius Perimeter and Area submitted by math_man
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1

Angle Bisector Theorem Examples

math_man | 05/13/15
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1 Angle Bisector Theorem Examples submitted by math_man
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1

Medians divide into smaller triangles of equal are...

math_man | 05/13/15
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1 Medians divide into smaller triangles of equal are... submitted by math_man
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1

Exploring Medial Triangles

math_man | 05/13/15
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1 Exploring Medial Triangles submitted by math_man
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Proving that the Centroid is 2-3rds along the Medi...

math_man | 05/13/15
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1 Proving that the Centroid is 2-3rds along the Medi... submitted by math_man
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Median Centroid Right Triangle Example

math_man | 05/13/15
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1 Median Centroid Right Triangle Example submitted by math_man
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1

Proof - Triangle Altitudes are Concurrent (Orthoce...

math_man | 05/13/15
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1 Proof - Triangle Altitudes are Concurrent (Orthoce... submitted by math_man
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1

Review of Triangle Properties

math_man | 05/13/15
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1 Review of Triangle Properties submitted by math_man
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1

Euler Line

math_man | 05/13/15
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1 Euler Line submitted by math_man
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Euler's Line Proof

math_man | 05/13/15
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1 Euler's Line Proof submitted by math_man
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1

Common Orthocenter and Centroid

math_man | 05/13/15
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1 Common Orthocenter and Centroid submitted by math_man
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Quadrilateral Overview

math_man | 05/13/15
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1 Quadrilateral Overview submitted by math_man
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1

Proof - Opposite Sides of Parallelogram Congruent...

math_man | 05/13/15
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1 Proof - Opposite Sides of Parallelogram Congruent... submitted by math_man
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Proof - Diagonals of a Parallelogram Bisect Each O...

math_man | 05/13/15
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1 Proof - Diagonals of a Parallelogram Bisect Each O... submitted by math_man
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Proof - Opposite Angles of Parallelogram Congruent...

math_man | 05/13/15
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1 Proof - Opposite Angles of Parallelogram Congruent... submitted by math_man
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Proof - Rhombus Diagonals are Perpendicular Bisect...

math_man | 05/13/15
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1 Proof - Rhombus Diagonals are Perpendicular Bisect... submitted by math_man
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Proof - Rhombus Area Half Product of Diagonal Leng...

math_man | 05/13/15
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1 Proof - Rhombus Area Half Product of Diagonal Leng... submitted by math_man
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Area of a Parallelogram

math_man | 05/13/15
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1 Area of a Parallelogram submitted by math_man
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Problem involving angle derived from square and ci...

math_man | 05/13/15
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1 Problem involving angle derived from square and ci... submitted by math_man
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1

Area of a Regular Hexagon

math_man | 05/13/15
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1 Area of a Regular Hexagon submitted by math_man
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