About Course

Trigonometry is a branch of mathematics that studies relationships between side lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. Learn trigonometry for free—right triangles, the unit circle, graphs, identities, and more. Full curriculum of exercises and videos. This is the property of khanacademy.org and is available for free on their website.

Topics for this course

101 Lessons

Trigonometry with right triangles

Introduction to the trigonometric ratios
Intro to the trigonometric ratios
Trigonometric ratios in right triangles
Solving for a side in a right triangle using the trigonometric ratios
Solving for a side in right triangles with trigonometry
Modeling with right triangles
Right triangle word problem
Trigonometric ratios and similarity
Triangle similarity & the trigonometric ratios
Trig challenge problem: verify identities
Trig challenge problem: trig values & side ratios
Sine and cosine of complementary angles
Sine & cosine of complementary angles
Using complementary angles
Trig word problem: complementary angles
Introduction to the Pythagorean trigonometric identity
Intro to the Pythagorean trig identity
The reciprocal trigonometric ratios
Finding reciprocal trig ratios
Using reciprocal trig ratios

Trigonometry with general triangles

The unit circle definition of sine, cosine, and tangent

Graphs of trigonometric functions

Trigonometric equations and identities

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