Can you find the third angle measure in a triangle if you know the other 2 angle measures?

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Acircular city park has a sidewalk directly through the middle that is 111 - feet long. if each bag of fertilizer covers 50 square feet, then determine how many bags of fertilizers the parks and recreation department needs to use to cover the circular park. ignore all the sidewalks around and through the park.

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0