Question

The difference between the circumferenc and diameter of circle is 45cm find their radius of circle

Answer 1

let the circumference be X

Diameter = x- 45

Circumference = πd

X = 22/7 × X-45

X = 22/7X - 990/7

HH

Answer 2

Circumference of circle = 2πr

Diameter of circle = 2r

According to question,

2πr - 2r = 45

2 × 22÷7 × r - 2r = 45

44r ÷ 7 = 45 + 2r

44r = 7(45 + 2r)

44r = 315 + 14r

30r = 315

r = 10.5

So the radius of the circle is 10.5