Trigonometry Basics

In a right triangle, what is the ratio of the opposite side to the hypotenuse called?

Sine (sin)

In a right triangle, what is the ratio of the adjacent side to the hypotenuse called?

Cosine (cos)

In a right triangle, what is the ratio of the opposite side to the adjacent side called?

Tangent (tan)

What is sin(30°)?

0.5 (1/2)

What is the Pythagorean identity relating sine and cosine?

sin²θ + cos²θ = 1