`A = (pi * r^2 ) / 2`

Enter a value for all fields

The Area of a Semicircle calculator computes the area of a semicircle based on the radius.

INSTRUCTIONS: Choose units and enter the following:

• (r)  This is the radius of the circle.

Area of Semicircle (A): The calculator returns the area in square meters.  However this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The formula for the area of a semi-circle is:

        A = ½•π•r²

where:

• A = area of semicircle
• r = radius of circle