# What is the circumference of a 31 dia circle?

Circumference = 2 * Pi * r

r(radius) = diameter/2 = 31/2 = **15.5**

Circumference = 2 * pi * 15.5

= **97.4 units**

==========( you could call it 97 units )

### How do you find circle a has a circumference of 24 m circle b has a radius of 5 m which circle has the greater circumference?

Circumference of circle B = 2*pi*r = 31.4 metres so B has the greater circumference. Circumference of circle B = 2*pi*r = 31.4 metres so B has the greater circumference. Circumference of circle B = 2*pi*r = 31.4 metres so B has the greater circumference. Circumference of circle B = 2*pi*r = 31.4 metres so B has the greater circumference.