Section 10.2 – Sines and Cosines

Sine and Cosine Ratios

For a given acute angle with a measure of θ°, the sine of, or sin θ°, is the ratio of the length of the side opposite to the length of the hypotenuse in any right triangle.

OR

can also be written as sin A…

For a given acute angle with a measure of θ°, the cosine of, or cos θ°, is the ratio of the length of the side adjacent to the length of the hypotenuse in any right triangle.

OR

can also be written as cos A…

SOH CAH TOA!!!!!!!!

Two Trigonometric Identities

AND