Lesson 3 of 4Module 1 · 0% of course
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Explore › Math › Geometry & Trigonometry › Geometry
Geometry & Trigonometry · Geometry

Trigonometry & Circles

SOH-CAH-TOA, radians, the unit circle, special angles, the Pythagorean identity, the laws of sines and cosines, and arc length and sector area, with surveying and navigation examples.

30 min · 6 steps · videoJump to quiz ↓
Introduction to the unit circle | Trigonometry | Khan Academy Khan Academy · 9 min
Open in YouTube
Step 1 of 6 · Overview30 min read ·
Key idea
Prereqs: Pythagoras; shapes & area. Next: Coordinate geometry; calculus (derivatives of sin, cos). Sources: OpenStax *Algebra and Trigonometry* ch. 7–10; Khan Academy.
Next: 1. Right triangles

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