x # Geometry

Khan Academy, , Prof. Salman Khan

Updated On 02 Feb, 19

##### Overview

Contents:
introduction to angles - Angles - Angles formed between transversals and parralel lines - Angles of parallel lines - The Angle Game - Similar triangles - Area and Perimeter - Circles: Radius, Diameter and Circumference - Area of a circle - The Pythagorean Theorem

45-45-90 Triangles - Intro to 30-60-90 Triangles - 30-60-90 Triangles II - Heron's Formula the Proof of Heron's Formula - An inscribed angle is half of a central angle that subtends the same arc - Area of Inscribed Equilateral Triangle (some basic trig used) - Right Triangles Inscribed in Circles (Proof) - Area of Diagonal Generated Triangles of Rectangle are Equal

## Lecture 20: Part 2 of the Proof of Herons Formula

4.1 ( 11 )

###### Lecture Details

Showing that the expression in part 1 is identical to Herons Formula

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Excellent course helped me understand topic that i couldn't while attendinfg my college. 