Question

Identify ER rounded to the nearest tenth.

Answer 1

ER ≈ 17.9

Explanation:

Using the cosine ratio in the right triangle.

cos61° =
`(adjacent)/(hypotenuse)` =
`(ER)/(MR)` =
`(ER)/(37)` ( multiply both sides by 37 )

37 × cos61° = ER, then

ER ≈ 17.9 ( to the nearest tenth )