Q: What is the length of half a circle called?

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The radius, from the centre of a circle to it's edge.

a hemisphere

The diameter is the length across the middle of a circle. Half of the diameter is called the radius.

the radius is half the diameter. radius is half of 11. Which is 5.5.

semicircleA half circle is called a semicircle.Half a circle is a semi-circle

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The radius, from the centre of a circle to it's edge.

There are a couple of different ways of finding the length of the chord of a circle. Probably the best is what is called the half angle formula.

a hemisphere

The diameter is the length across the middle of a circle. Half of the diameter is called the radius.

Half a circle is called a semi-circle. Sometimes it is called a half-moon.

the radius is half the diameter. radius is half of 11. Which is 5.5.

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

semicircleA half circle is called a semicircle.Half a circle is a semi-circle

The radius is half the diameter.

Semi = half

Length of a radius is always half the diameter of a circle. This means that the circle has a radius of 2cm.

the radius is half the length of the diameter of a circle.