www.reference.com/article/area-semicircle-ac74ac6fb847ce40

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.

www.reference.com/article/formula-area-semicircle-6e3650e4493cb454

The area of a semicircle is (?*R*R)/2. This means the radius of the semicircle is squared, multiplied by the constant pi, then divided by 2.

www.reference.com/article/determine-circumference-semicircle-e44c79f6976ca3d2

The perimeter of a semicircle is 1/2 of the circumference of the corresponding complete circle plus the diameter of the circle. The distance around the outside of a semicircle is generally called its perimeter.

www.reference.com/article/calculate-perimeter-circle-f646ee98aef3dce8

One simple way to calculate the perimeter of a circle is to multiply its radius by two and further multiply the product by pi. You need a ruler and a divider to accomplish this task.

www.reference.com/article/calculate-area-perimeter-shapes-df4ddd117cf0d8ba

Calculating the area of polygons requires specific formula, while calculating perimeters simply involves the addition of all sides of a polygon. Calculating the perimeter or area of circles and other monogons involve formulas that use the mathematical concepts of pi and...

www.reference.com/article/perimeter-parallelogram-calculated-91c9eca381b8235c

The perimeter of a parallelogram is equal to the sum of the four lengths that make up the parallelogram. Instead of adding up all four sides, a person can find the perimeter by adding the width and the height and then multiplying the sum by two.

www.reference.com/article/perimeter-rectangle-fdb9322ef95acc56

The perimeter of a rectangle is the sum of the length of all four sides. Alternate formulas for finding the perimeter are 2(length + width) and 2 x length + 2 x width.