Question

Use the image to answer the question.

The sides and angles of a right triangle are labeled.
▶Click for Long Desc

Use the inverse of cosine to find the indicated missing angle. Round your answer to the nearest tenth.

(1 point)
θ≈
°

Answer 1

I can’t read the picture — could you tell me the two side lengths shown (the adjacent side to θ and the hypotenuse)?

Procedure you can use meanwhile:
- cos θ = (adjacent)/(hypotenuse)
- θ = arccos(adjacent/hypotenuse)
- Enter the ratio into your calculator and take arccos (make sure it’s in degrees)
- Round to the nearest tenth of a degree.

Example: if adjacent = 9 and hypotenuse = 15, θ = arccos(9/15) = arccos(0.6) ≈ 53.1°.