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Geometry

by Khan Academy
  1. 73 Thumbnail

    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 trig used)

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    Right Triangles Inscribed in Circles (Proof)

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    Area of Diagonal Generated Triangles of Rectangle are Equal

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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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    Perpendicular Radius Bisects Chord

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    Circumcenter of a Triangle

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    Circumcenter of a Right Triangle

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    Three Points Defining a Circle

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    Point Line Distance and Angle Bisectors

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    Incenter and incircles of a triangle

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    Angle Bisector Theorem Proof

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    Inradius Perimeter and Area

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    Angle Bisector Theorem Examples

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    Medians divide into smaller triangles of equal area

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    Exploring Medial Triangles

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    Proving that the Centroid is 2-3rds along the Median

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    Median Centroid Right Triangle Example

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    Proof - Triangle Altitudes are Concurrent (Orthocenter)

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    Review of Triangle Properties

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    Euler Line

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    Euler's Line Proof

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    [Deleted Video]

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    Common Orthocenter and Centroid

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    Quadrilateral Overview

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    Proof - Opposite Sides of Parallelogram Congruent

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    Proof - Diagonals of a Parallelogram Bisect Each Other

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    Proof - Opposite Angles of Parallelogram Congruent

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    Proof - Rhombus Diagonals are Perpendicular Bisectors

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    Proof - Rhombus Area Half Product of Diagonal Length

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    Area of a Parallelogram

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    Problem involving angle derived from square and circle

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    Area of a Regular Hexagon