Lesson 2 of 4Module 1 · 0% of course
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Geometry & Trigonometry · Geometry

Triangles & Pythagoras

Triangle basics (angle sum, types, similarity), the Pythagorean theorem with a visual proof, Pythagorean triples, the converse test for right angles, distance between points, and real uses from carpentry to screens.

30 min · 6 steps · videoJump to quiz ↓
How many ways are there to prove the Pythagorean theorem? - Betty Fei TED-Ed · 5 min
Open in YouTube
Step 1 of 6 · Overview30 min read ·
Key idea
Prereqs: Shapes, area & volume. Next: Trigonometry & circles; Coordinate geometry. Sources: Euclid, *Elements* I.47; TED-Ed 'How many ways are there to prove the Pythagorean theorem?'; Eddie Woo.
Next: 1. Triangles

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