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Q: Is half a circle always called a semi-circle?

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A semicircle.

Half the diameter of a circle called the semicircle

Half a circle is called a semicircle

A semicircle is half a circle, so its area is half that of a circle: radius = 1/2 diameter = 22 ÷ 2 = 11 area = 1/2πr2 = 1/2π112 ~= 190 sq in

The circumference of a circle is 2{pi}r. So, for a semicircle it is half this, that is {pi}r. The perimeter of the semicircle is the round bit ({pi}r) plus a diameter of the circle (2r) perimeter = {pi}4 + 2 x 4 ~= 20.6 in Area of a circle is {pi}r2, so for a semicircle it is half this. area ={pi}42 / 2 ~= 25.1 in2.

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A half circle is called a semicircle.

Half a circle is called a "semicircle" in geometry.

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A semicircle.

A semicircle means a half circle.

A semicircle is half of a 2D circle. A hemisphere is half of a 3D circle called a sphere.

Half the diameter of a circle called the semicircle

Half a circle is called a semicircle

Half of A circle

semicircle

Semicircle is HALF of a circle!

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