Find the diameter and the radius of a circle with a circumference of 465 cm. Give the answer to the nearest centimetre. Use π = 3۰142 or the π button on a calculator. Image caption, Divide the ...

This is the same as π × 𝒓 × 𝒓. The formula for the area of a circle is used by multiplying π by the square of the radius. This can be entered on a calculator in different ways.