Question

1. Find the missing reference angle using arcsin, arccos, or arc tangent. (Round to

the nearest whole number)
39
10
1?
Your answer

Answer 1

15°

Explanation:

Reference angle =
`\theta`

Side Opposite to reference angle = 10

Hypotenuse = 39

Let's use arcsin:

recall: SOHCAHTOA

Therefore:

`\theta = sin^(-1)((Opp)/(Hyp))`

Substitute

`\theta = sin^(-1)((10)/(39))`

`\theta` = 14.8571655° = 15° (to nearest whole number)