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A semicircle is one half of a circle. It looks like a straight line with a circular arc connecting its ends to one another. The straight edge of the semicircle is the diameter and the arc is half the circumference of a full circle with the same diameter. You can find the radius of a semicircle using the formulas for circumference and diameter.

www.wikihow.com/Find-the-Area-of-a-Semicircle

To find the area of a semicircle, start by finding the area of the full circle using the formula πr^2, where r is the radius of the circle. If you don't know the radius, you can find it by dividing the diameter of the circle by 2. Once you've found the area of the full circle, just divide it by 2 to find the area of the semicircle.

Best Answer: Semi circle is half circle. radius or diameter of semicircle is same as radius or diameter of circle of which the semicircle is part of it. Do you mean perimeter of semicircle ? perimeter = 2πr/2 + 2r = πr + 2r -----

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To find the perimeter of a semi circle, you have to know the diameter (the length of its straight edge). For example, if the diameter of your semi circle is 12 centimeters, the formula becomes P = 1/2 (3.14 × 12) + 12.

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Semicircle Calculator. Calculations at a semicircle. Radius and diameter refer to the original circle, which was bisected through its center. Enter one value and choose the number of decimal places. Then click Calculate.

So, we can also calculate the perimeter of a semicircle given its diameter or radius. Lesson Summary. Some key facts to remember: A semicircle is half a circle. Diameter is the base of a ...

www.reference.com/math/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. A semicircle can be seen as the shape that is formed when a circle is cut in half along its diameter.

www.mathopenref.com/semicircle.html

A semicircle is a half circle, formed by cutting a whole circle along a diameter line, as shown above. Any diameter of a circle cuts it into two equal semicircles. * An alternative definition is that it is an open arc. See note at end of page. Area of a semicircle. The area of a semicircle is half the area area of the circle from which it is made.