Angles and Trig Ratios

Front

What is an angle?

Back

An angle is formed by two rays (sides) that share a common endpoint (vertex). It is measured in degrees or radians.

Front

What is the terminal side of an angle?

Back

The terminal side of an angle is the position of the ray after the angle has been rotated from the initial side.

Front

What is the cosine of an angle?

Back

The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse.

Front

What is the sine of an angle?

Back

The sine of an angle in a right triangle is the ratio of the length of the opposite side to the length of the hypotenuse.

Front

What is the tangent of an angle?

Back

The tangent of an angle in a right triangle is the ratio of the length of the opposite side to the length of the adjacent side.

Front

What is the relationship between sine, cosine, and tangent?

Back

Front

What is a reference angle?

Back

A reference angle is the acute angle formed by the terminal side of an angle and the x-axis.

Front

How do you find the cosine of an angle in the unit circle?

Back

In the unit circle, the cosine of an angle is the x-coordinate of the point where the terminal side intersects the circle.

Front

Back

Front

What is the Pythagorean identity?

Back