Radius Math Problem

Question

The Radius of circle A is 4 ft. The radius of circle b is 5 ft greater than the radius of circle A. The radius of circle C is 4 ft greater than the radius of circle B. The radius of circle D is 3 ft less than the radius of Circle C. What is the are of each circle? How many times greater than the area of Circle A is the area of circle D?

Answer 1

Area of circle = pi r²

 

Area of circle A =pi(4)²  = 16 pi

 

Area of circle B = pi(4+5)²= 81pi

 

Area of circle C = pi(4+5+4)²= 169pi

 

Area of circle D = pi(4+5+4-3)²= 100pi