Question

a) The difference between the circumference and the diameter of a circle is 90cmFind the radius of the circle​

Answer 1

r=21.01 cm

Explanation:

2r = diameter

Circumference of a circle = pi 2r

difference = 90

pi2r - 2r =90

2r (pi-1) =90

90/(2(pi-1) = r = 21.01 cm