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/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/calculate-circumference-12bc79e1f122c17c

The circumference of a circle is calculated by multiplying pi by the diameter, or 2 pi times the radius. The diameter or radius value is required to calculate circumference.

www.reference.com/article/calculate-circumference-circle-cd38f7adede000a6

To calculate the circumference of a circle, multiply the diameter of the circle in question by pi. You need to know the diameter of the circle to complete this task.

www.reference.com/article/circumference-earth-cbdefa2b2967339

The circumference of Earth is 24,901.55 miles at the equator, located at zero degrees latitude and the point at which the planet is the widest. The circumference measures the distance around Earth. Measured around the poles, the circumference is slightly smaller at 24,8...

www.reference.com/article/measure-circumference-abaa11cf7cc64436

To measure a circle's circumference, find the circle's diameter, then multiply the diameter by pi to find the circumference. If you only have the radius, multiply it by two to find the circle's diameter.