If the perimeter of a circle is equal to that of square then find the ratio of the area of circle and to the area of plz

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Given: △acm, m∠c=90°, cp ⊥ am , ac: cm=3: 4, mp-ap=1. find am.

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?