Trigonometric Ratios

Front

What are the three primary trigonometric ratios?

Back

Sine (sin), Cosine (cos), Tangent (tan).

Front

Define Sine (sin) in terms of a right triangle.

Back

Sine of an angle is the ratio of the length of the opposite side to the length of the hypotenuse.

Front

Define Cosine (cos) in terms of a right triangle.

Back

Cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.

Front

Define Tangent (tan) in terms of a right triangle.

Back

Tangent of an angle is the ratio of the length of the opposite side to the length of the adjacent side.

Front

What is the Pythagorean identity involving sine and cosine?

Back

sin²(θ) + cos²(θ) = 1.

Front

How do you find the sine of an angle using a calculator?

Back

Use the sine function key and input the angle in degrees or radians.

Front

What is the value of sin(30°)?

Back

0.5.

Front

What is the value of cos(60°)?

Back

0.5.

Front

What is the value of tan(45°)?

Back

1.

Front

If sin(A) = 0.5, what is the measure of angle A?

Back

A = 30° or A = 150°.