The area of a circle is 1256 square inches. what is the radius?

The radius is 20.

Step-by-step explanation:

We know the area of a circle is found by

A = pi r^2

We know A = 1256 and pi is approximated by 3.14

1256 = 3.14 r^2

Divide each side by 3.14

1256/3.14 = 3.14/3.14 r^2

400 = r^2

Take the square root of each side

sqrt(400) = sqrt(r^2)

20 =r

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

the correct answer is d

hope this