Trig Ratios

Front

What is the definition of sine in a right triangle?

Back

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

Front

What is the definition of cosine in a right triangle?

Back

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

Front

What is the definition of tangent in a right triangle?

Back

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

Front

If sin(θ) = 0.5, what is the value of θ in degrees?

Back

θ = 30° or θ = 150°.

Front

What is the Pythagorean identity involving sine and cosine?

Back

Front

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

Back

Set the calculator to degree mode, input the angle, and press the sine function key.

Front

What is the relationship between sine and cosine?

Back

Front

What is the sine rule in trigonometry?

Back

Front

If you know the opposite side and hypotenuse, which trig function do you use?

Back

You use the sine function.

Front

What is the cosine of angle P if the adjacent side is q and the hypotenuse is r?

Back