Geometry

Geometry of the circle


There are lots of terms used to describes parts of circles.

The lines that can be drawn on a circle are ...




The areas that a circle is often broken up into are ...




How do I calculate the circumference of a circle?


The circumference of a circle is the distance around the edge of a circle and it is calculated as ...


If the diameter of a circle is d and the radius of a circle is r then ...



Here's an example, if a circle had a radius of 6cm then it's circumference would be ...



How do I calculate the area of a circle?


The area of a circle is calculated using the formula ...


So, if a circle had a radius of 9cm then its area would be ...