Use compatible number to find two estimates that the quotient is between 1,624 divided by 3

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

Can someone explain to me how to do

Segment wx is shown explain how you would construct a perpendicular bisector of wx using a compass and a straightedge