Question

The circumference of a circle is 9.31cm. Find the length of the diameter. Give your answer rounded to 2 DP.

Answer 1

2.96cm

Explanation:

C= 2x Pi x Radius

9.31 = 2 x Pi x Radius

9.31/2 = Pi x Radius

4.655 = Pi x Radius

4.655/3.14 = Radius

1.4824840764331210191082802547771 = Radius

Now, that you have worked out the radius which is half the diameter

Radius + Radius = Diameter

1.4824840764331210191082802547771 + 1.4824840764331210191082802547771 = 2.964968153

= 2.96cm to 2 d.p

You can double check because C= 2 x Pi x Radius

9.31 = 2 x 3.14 x 1.482