Unit 4 Trig Review

Front

What is the cosine of angle A if the adjacent side is 3 and the hypotenuse is 5?

Back

cosA = 3/5

Front

How do you find the length of a missing side in a right triangle?

Back

Use the Pythagorean theorem: a² + b² = c², where c is the hypotenuse.

Front

If one side of a right triangle is 16.2 and the other side is 16.0, what is the length of the hypotenuse?

Back

Approximately 22.6 (using Pythagorean theorem).

Front

What is the formula to calculate the length of a side in a right triangle using sine?

Back

sin(θ) = opposite/hypotenuse.

Front

What is the formula to calculate the length of a side in a right triangle using cosine?

Back

cos(θ) = adjacent/hypotenuse.

Front

If John needs to round his answer to the nearest tenth, what does that mean?

Back

It means to round the number to one decimal place.

Front

What is the measure of an angle if the opposite side is 5 and the adjacent side is 12?

Back

Use tan(θ) = opposite/adjacent; θ = arctan(5/12).

Front

How do you find the measure of an angle in a right triangle using cosine?

Back

Use cos(θ) = adjacent/hypotenuse; θ = arccos(adjacent/hypotenuse).

Front

What is the sine of a 30-degree angle?

Back

sin(30°) = 1/2.

Front

What is the cosine of a 60-degree angle?

Back

cos(60°) = 1/2.