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Formulas
Coordinates
Reference Angles
Radians
Misc.
100

This trigonometry ratio uses the fraction adjacent over hypotenuse.

Cosine(x)

100
What is sin(90º)?

1

100

What is the reference angle of 150º?

30 degrees.

100

How many radians is equal to 180º?

π radians

100

In which way do negative angles rotate?

Clockwise

200

This equation is a way of finding the x-coordinate on a unit circle.

 x=cos(theta)

200

What is sin(150º)?

1/2 or 0.5

200

What is the reference angle of 45º?

45 degrees

200
How many radians is equal to 90º?

π/2 radians.

200

Name one fact about the unit circle from its definition.

Its radius is 1 OR it is centered at the origin.
300

This trigonometry ratio uses the fraction opposite over hypotenuse.

Sine(theta)

300

What is cos(3π/2)?

-1/2

300
What is the reference angle of 240º?

60 degrees

300

How many radians is 135º?

3π/4 radians.

300

What is (√2/2)2 equal to?

2/4 or 1/2

400

This trig ratio is what you get when you divide sine by cosine.

tangent

400

What is sin(4π/3)?

-√3/2

400
What is the reference angle of 2π/3?

60 degrees (or π/3).

400
How many radians is 330º?

11π/6 radians

400

What positive angle is coterminal (shares a terminal side with) to -45º?

315º
500

What is the name of this formula?: cos2x + sin2x = 1

The Pythagorean Identity

500

What is cos(7π/4)?

-√2/2

500

What is the reference angle of 5π/4?

45 degrees (or π/4).

500

How many radians are in 390º?

13π/6 radians.

500

What negative angle is at the point (-√3/2, -1/2)?

-150º or -7π/6