$uckafr33 wrote:

A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. No wire is left over. Which of the following represents the total area, in square meters, of the circular and square regions in terms of r?

a) pi r^2

b) pi r^2 +10

c) pi r^2 + 1/4 pi^2 r^2

d) pi r^2 + (40 - 2 pi r)^2

e) pi r^2 + (10 - 1/2 pi r)^2

Let the first peice be x meters in length, other side = 40-x

circumference of circle = x; 2pi r = x;

area of circle + area of square

pi r^2 + ((40-x)/4)^2;

pi r^2 + (10-2pi r/4)^2

pi r^2 + (10-pi r/2)^2;

E