Radians & the Unit Circle REVIEW

Front

What is a radian?

Back

A radian is a unit of angular measure defined as the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.

Tags

CCSS.HSF.TF.A.1

Front

How do you convert radians to degrees?

Back

Tags

CCSS.HSF.TF.A.1

Front

What is the unit circle?

Back

The unit circle is a circle with a radius of 1 centered at the origin of a coordinate plane, used to define trigonometric functions.

Tags

CCSS.HSF.TF.A.2

Front

What is the reference angle?

Back

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

Front

How do you find the reference angle for an angle in standard position?

Back

To find the reference angle, subtract the angle from 180° if it is in the second quadrant, or subtract 360° if it is in the fourth quadrant.

Front

What are coterminal angles?

Back

Coterminal angles are angles that share the same terminal side when drawn in standard position, differing by multiples of 360°.

Front

How do you find coterminal angles?

Back

To find a coterminal angle, add or subtract multiples of 360° from the given angle.

Front

What is the sine of an angle in the unit circle?

Back

The sine of an angle is the y-coordinate of the point on the unit circle corresponding to that angle.

Tags

CCSS.HSF.TF.A.2

Front

What is the cosine of an angle in the unit circle?

Back

The cosine of an angle is the x-coordinate of the point on the unit circle corresponding to that angle.

Tags

CCSS.HSF.TF.A.2

Front

What is the tangent of an angle in the unit circle?

Back

Tags

CCSS.HSF.TF.A.2