Answer:
ER ≈ 17.9
Step-by-step explanation:
Using the cosine ratio in the right triangle.
cos61° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{ER}{MR}[/tex] = [tex]\frac{ER}{37}[/tex] ( multiply both sides by 37 )
37 × cos61° = ER, then
ER ≈ 17.9 ( to the nearest tenth )
