Question

If the radius of the outer circle is 11 cm and the width of the path is 4cm. Find (a) the radius of the inner circle. (b)the area of the path

Answer 1

Radius of outer circle = 11cm
Width of path = 4cm
(a)Radius of inner circle = 7cm [Ans]
(b)Area of path= Area of outer circle - Area of inner circle
Area of path= πR^2 - πr^2
= π(R^2 - r^2)
=π(121-49)
Area of path=72π [Ans]