Question

the circumference of a cicle exceeds its diameter by 18cm . find the radius of the circle

Answer 1

circumference is 2πr and circumferce- diameter =18
2πr-2r=18
2r(π-1)=18
r(π-1)=18/2
r=9/π-1
r=9/(22/7-1)
r=9/(15/7)
r=9*7/15
r=21/5=4.5