Question

the circumference of a circle exceed the diameter by 15 cm . find the radius of the circle​

Answer 1

Answer:

Step-by-step explanation:

Let the diameter of the circle be d.
Circumference =  πd
Given,
πd = d + 15
= πd−d=15
⇒d(π−1)=15

⇒d(227−1)=15

⇒d(157)=15

⇒d=7cm

So, circumference πd=22cm

Answer 2

Answer:

3.5 cm

Step-by-step explanation:

circumference = d + 15 cm
circumference of circle = 2 π r

d = 2r

2 π r = 2 r + 15

2 π r - 2 r = 15

2 r ( π - 1 ) = 15

2 r (22/7 - 1) = 15
2 r (15/7 ) = 15
2 r = 7

r = 7/2

r = 3.5 cm