The perimeter of a quarter circle is 7.14 inches . what is the quarter circles radius?

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

Can any one me with the answers to these questions asap?

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?