2.     an earthquake was felt throughout a circular area of 1,808.64 square miles. what was the radius of the circular area?                 a.  24 miles      b.  12 miles      c.  576 miles      d.  20 miles

A. 24 miles

Step-by-step explanation:

Using 3.14 for π, we have ...

... Area = πr^2

... √(Area/π) = r = √(1808.64/3.14) = √576 = 24 . . . . miles

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