Question

if the circumference of a circle exceed its diameter by 30cm , find the radious of the circle .​

Answer 1

Answer:7 cm

Step-by-step explanation:

Let the diameter be x cm.

Circumference=2πr

x+30=2*22*x/2*7

22x=7x+210

15x=210

x=14 cm

Radius=7 cm

Answer 2

Answer: 7 cm

Step-by-step explanation:

assume @ to be pi ( my keyboard doesnt have pi symbol )

circumference of circle = 2@r

diameter of circle = 2r

=> 2@r = 2r + 30

=> 2@r - 2r =30

=> 2r ( @-1 ) = 30

we know that pi (@) = 22/7

=> 2r ( 22/7 - 1 ) = 30

=> 2r (15/7 ) = 30

=> 2r = 30 x 7/15

=> 2r = 14

r = 14/2 =7 cm

there fore radius is 7 cm