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# Geometry

• by Khan Academy
• 113 videos
• 198,194 views
• Last updated on Jul 2, 2014
Videos on geometry. Basic understanding of Algebra I necessary. After this, you'll be ready for Trigonometry.

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•  Euclid as the Father of Geometry 8:23 Language and Notation of Basic Geometry 12:58 Lines, Line Segments, and Rays 3:38 Language and Notation of the Circle 11:13 Angle Basics 6:49 Measuring Angles in Degrees 8:23 Using a Protractor 3:26 Measuring Angles 4:05 Complementary and Supplementary Angles 8:31 Angles at the intersection of two lines 7:19 Proof-Vertical Angles are Equal 4:51 Angles Formed by Parallel Lines and Transversals 7:08 Proof - Sum of Measures of Angles in a Triangle are 180 6:31 Triangle Angle Example 1 6:03 Triangle Angle Example 2 4:55 Triangle Angle Example 3 5:43 Challenging Triangle Angle Problem 8:37 Proof - Corresponding Angle Equivalence Implies Parallel Lines 5:18 Finding more angles 6:05 Sum of Interior Angles of a Polygon 9:11 Congruent Triangles and SSS 11:29 SSS to Show a Radius is Perpendicular to a Chord that it Bisects 8:20 Other Triangle Congruence Postulates 13:28 Two column proof showing segments are perpendicular 11:06 Sum of the exterior angles of convex polygon 5:24 Finding Congruent Triangles 7:28 More on why SSA is not a postulate 7:24 Congruent Triangle Proof Example 5:46 Congruent Triangle Example 2 12:14 Congruent legs and base angles of Isosceles Triangles 9:03 Equilateral Triangle Sides and Angles Congruent 6:30 Equilateral and Isosceles Example Problems 6:27 Another Isosceles Example Problem 5:34 Example involving an isosceles triangle and parallel lines 3:16 Figuring out all the angles for congruent triangles example 4:35 Perimeter and Area Basics 8:25 Triangle Area Proofs 10:23 Interesting Perimeter and Area Problems 8:13 Koch Snowflake Fractal 9:12 Area of an Equilateral Triangle 3:43 Area of Koch Snowflake (part 1) - Advanced 12:30 Area of Koch Snowflake (part 2) - Advanced 6:33 Challenging Perimeter Problem 9:56 Similar Triangle Basics 9:17 Similarity Postulates 12:14 Similar Triangle Example Problems 9:24 Similarity Example Problems 7:37 Challenging Similarity Problem 9:53 Similarity example where same side plays different roles 6:05 Finding Area Using Similarity and Congruence 10:07 Pythagorean Theorem Proof Using Similarity 9:53 30-60-90 Triangle Side Ratios Proof 7:00 45-45-90 Triangle Side Ratios 5:42 30-60-90 Triangle Example Problem 6:41 The Golden Ratio 14:42 Introduction to angles (old) 9:56 Angles (part 2) 9:05 Angles (part 3) 9:48 Angles formed between transversals and parallel lines 7:53 Angles of parallel lines 2 5:15 The Angle Game 9:02 Similar triangles 9:34 Similar triangles (part 2) 9:55 Angle Game (part 2) 9:50 Acute Right and Obtuse Angles 5:33 Area and Perimeter 12:20 Circles: Radius, Diameter and Circumference 11:05 Area of a circle 6:45 The Pythagorean Theorem 10:46 Pythagorean Theorem II 9:37 45-45-90 Triangles 9:31 Intro to 30-60-90 Triangles 9:40 30-60-90 Triangles II 4:49 Solid Geometry Volume 3:56 Cylinder Volume and Surface Area 8:07 Heron's Formula 4:43 Part 1 of Proof of Heron's Formula 11:00 Part 2 of the Proof of Heron's Formula 12:08 Inscribed and Central Angles 14:17 Area of Inscribed Equilateral Triangle (some basic trig used) 11:39 Right Triangles Inscribed in Circles (Proof) 5:35 Area of Diagonal Generated Triangles of Rectangle are Equal 4:36 Triangle Medians and Centroids 9:00 Triangle Medians and Centroids (2D Proof) 15:15 Rhombus Diagonals 4:38 2003 AIME II Problem 7 13:13 Perpendicular Radius Bisects Chord 6:57 Circumcenter of a Triangle 12:30 Circumcenter of a Right Triangle 5:42 Three Points Defining a Circle 10:09 Point Line Distance and Angle Bisectors 10:57 Incenter and incircles of a triangle 7:58 Angle Bisector Theorem Proof 8:35 Inradius Perimeter and Area 7:29 Angle Bisector Theorem Examples 3:04 Medians divide into smaller triangles of equal area 7:46 Exploring Medial Triangles 11:33 Proving that the Centroid is 2-3rds along the Median 6:56 Median Centroid Right Triangle Example 9:01 Proof - Triangle Altitudes are Concurrent (Orthocenter) 10:01
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