Question

Circumference of circle exceeds its diameter by 18cm find its raidius

Answer 1

Hello,

the circumference of circle:
C = 2πr
the diameter is:
d=2r

so it must be:
C=d+18;
2πr=2r+18;
2πr-2r=18;
2r(π-1)=18;
2r(15/7) =18;
r = (18 ×7)/30= 126/30=4.2 cm

The raidius is 4.2 cm

bye :-)