Trigonometry +Unit Circle

Front

What is the value of cos(-240°)?

Back

-0.5

Front

In which quadrants is cosθ positive?

Back

The 1st and 4th quadrants.

Front

If a lighthouse is 175 feet tall and the angle of elevation is 5°, how far are you from the bottom of the lighthouse?

Back

2000.3 feet.

Front

What is the degree measure of the angle -590°?

Back

-590°.

Front

Find the measure of the missing angle if the options are 64°, 26°, 61°, and 0.008°.

Back

26°.

Front

Define the unit circle.

Back

A circle with a radius of 1 centered at the origin of a coordinate plane.

Front

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

Back

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

Front

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

Back

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

Front

How do you convert degrees to radians?

Back

Multiply degrees by π/180.

Front

What is the relationship between sine and cosine in a right triangle?

Back

sin(θ) = opposite/hypotenuse; cos(θ) = adjacent/hypotenuse.