Question

the circumference of the circle exceed the diameter by 16.8 find the radius

Answer 1

2*pi*r=2r+16.8
2*pi*r-2r=16.8
2r(pi-1)=16.8
2r=16.8/pi-1
2r=7.85
r=3.925
radius = 3.925 units

Answer 2

the circumference of circle is pi d

now pi d -d=16.8

substituting value of pi=3.14 we get

3.14 d-d=16.8

2.14 d=16.8

so d =16.8/2.14=7.85

now circumference =3.14 d=3.14* 7.85=24.65 cm