How Do You Find the Area of a Semicircle?
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To find the area of a semicircle, use the formula 1/2(pi x r^2). You need the value of “r,” or radius of the circle, and pi.

Determine the radius
Measure the distance from the center of the circle of which the semicircle is part to its edge. This is its radius.

Find r2
Multiply the radius of the semicircle by itself.

Multiply pi by r^2
Find the product of pi, which is rounded to 3.14, and the square of the radius.

Determine the area
Using the formula for finding the area of a semicircle, divide the product of the squared radius and pi by 2. If the radius of the semicircle is 2 centimeters, then the area is 1/2(3.14 x 2 x 2), or 6.28 square centimeters.
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