# Area of a Semi Circle Support Page

Welcome to our Area of a Semi Circle page.

Here you will find a range of free printable area sheets and support, which will help your child to learn to work out the area of different semi circles.

## Area of a Semi-Circle

### How to find the Area of a Semi Circle

A semi-circle is a half a circle. The area of a semi-circle is equal to half of the area of a circle with the same radius.

To find the area of a semi circle, follow these simple steps:

• find the radius of the circle (the distance from one side to the center of the circle). It is the same as half of the diameter of the circle.
• multiply this amount by pi (π)
• halve this answer to find the area of the semi-circle
• you have now found the area of the semicircle.
• the formula for the circumference of a circle is A = ½ (π x r x r) or A = ½ (π r2), where A is the area and r is the radius of the circle.

Pi (written π) is a special mathematical number which is used to help calculate areas and perimeters of circles.

Pi always has the same value which is 3.141592...

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