What is the diameter of a circle with circumference 5?

1 Answer
Jun 26, 2018

D = 1.6D=1.6

Explanation:

Using;

C = 2pirC=2πr

Where;

C = "Circumference"C=Circumference

r = "Radius"r=Radius

Recall;

D = 2rD=2r

D = "Diameter"D=Diameter

Therefore;

r = D/2r=D2

Substituting rr into the main equation..

C = 2pi(D/2)C=2π(D2)

C = cancel2pi(D/cancel2)

C = piD

Making D the subject;

C/D = (piD)/D

C/pi = (cancelpiD)/cancelpi

D = C/pi

When;

C = 5

pi = 22/7

D = 5/(22/7)

D = 5 div 22/7

D = 5 xx 7/22

D = 35/22

D = 1.59090

D = 1.6