Question

the circumference of a circle exceeds its diameter by 30 cm find the radius of the circle

Answer 1

let the radius be x then diameter be 2x circumference be 2x+30

atq

2 × 22/7 × x = 2x+30

44x/7 = 2x+30
44x = 14x + 210

30x=210
x=7cm

radius = 7cm

Answer 2

Let circumference be x-3
So diameter will be x
So radius will be x/2
x-3=2×22/7×x^2/4
x-3=11x^2/7
7x-21=11x^2