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Part A     A.  400 sq ft.

Part B     A.   509 sq ft

Step-by-step explanation:

Part A

Area of square = side squared

Since all the sides of the square are congruent and the perimeter is 80, then the length of each side is 80/4 = 20

A = 20^2 = 400 sq ft

Part B

C = πd

80 =

80/π = d

r = d/2 = 80/2π = 40/π

A = πr^2 = π(40/π)^2

   = 1600π/π^2 = 1600/π = 1600/3.14 = 509 sq ft

32/80  

91/140

the last one 54 doesn't go into 45. 54/100 ?

step-by-step explanation: