A piece of wire 20cm long is cut into two pieces. One piece is used for a square shape and the other a circle shape with radius r cm.
i) write down the area and the perimeter of the circle in terms of r.
I would go
A = ∏r^2
A/r^2 = ∏
r^2 = A/∏
r = sqrt(A/∏)
P = 2∏r
r = P/2∏
But not sure if this is right
ii) find the perimeter of the square in terms of r
iii) using your answer in part ii) state the length of one side of the square in terms of r.
iv) find the area of the square in terms of r
v) find the total area A cm^2 of the circle and the square in terms of r
i'm unsure how to do these one any help would be greatly appreciated!!