Math III - 2 Lesson 4.4, 4.5, 4.6

Front

Back

Front

What are the coordinates of the point where the terminal side of the angle 90° intersects the unit circle?

Back

(0, 1)

Front

Back

36 degrees

Front

Back

Front

What is the reference angle for 318°?

Back

42 degrees

Front

Define a reference angle.

Back

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

Front

What is the unit circle?

Back

The unit circle is a circle with a radius of 1 centered at the origin of the coordinate plane.

Front

How do you find the coordinates of a point on the unit circle for a given angle?

Back

Use the cosine and sine of the angle: (cos(angle), sin(angle)).

Front

What is the cosine of 90°?

Back

0

Front

What is the sine of 90°?

Back

1