Khan Academy

Solving for a side in right triangles with trigonometry (K-A)

Solving for a side in right triangles with trigonometry-video (K-A)

Intro to inverse trig functions (K-A)

Angles of elevation and depression (K-A)

Right triangle trigonometry review (K-A)

Right triangle word problem (K-A)

Triangle similarity & the trigonometric ratios (K-A)

Trig challenge problem: trig values & side ratios (K-A)

Trig challenge problem: verify identities (K-A)

Sine & cosine of complementary angles-video (K-A)

Trig word problem: complementary angles (K-A)

Using complementary angles (K-A)

Proof of the law of sines (K-A)

Solving for a side with the law of sines (K-A)

Solving for an angle with the law of sines (K-A)

Proof of the law of cosines (K-A)

Solving for a side with the law of cosines (K-A)

Solving for an angle with the law of cosines (K-A)

Laws of sines and cosines review (K-A)

Trig word problem: stars (K-A)

Similar shapes & transformations (K-A)

Determining similar triangles (K-A)

Intro to triangle similarity (K-A)

Proving slope is constant using similarity (K-A)

Triangle similarity postulates/criteria (K-A)