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Subjects>Math>Geometry

What is the area of a semicircle when the radius is 21?

Anonymous

∙ 14y ago

Updated: 4/28/2022

The equation for area of a circle is A=pi x R x R. A semicircle is half a circle, so we calculate the area of a circle and divide by 2. The area of the circle would be approximately 1384.74. Thus the area of the semicircle would be 692.37.

Wiki User

∙ 14y ago

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Q: What is the area of a semicircle when the radius is 21?

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Continue Learning about Geometry

What is area of semicircle?

The area of a semicircle is half of the area of a circle. The area of a circle is pi x radius x radius. So the area of a semicircle is 1/2 x pi x radius x radius or (pi x radius x radius) / 2.

How do you calculate the radius of s semicircle?

Calculating the radius of a semicircle depends on what information about the semicircle is given.

What is the diameter of a semicircle?

In a semicircle, the diameter is the straight line. It is also equal to double the radius, and that property allows it to be used when calculating area and circumference.

What is the diameter of a semicircle with a radius of 5 ft?

Radius is = to half the diameter so.... when the radius of the semicircle is 5ft then the diameter is 10ft.

What is a semicircle?

a semicircle is half of a circle... so like a circle cut in half, in a straight line. just for some information you may also need in the future: area of a semicircle: multiply the radius by itself and then multiply that by pi (approx. 3.14). divide that by 2. perimeter (circumference) of a semicircle: pi times radius. hope that helps.

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