It is a semicircle.
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Being half of the circumference of a circle, a semi circle has one side
The circumference is the distance AROUND a circle. The diameter is the distance ACROSS a circle. The radius is the the distance FROM THE CENTER of the circle (same thing as one-half of the diameter).
The radius is one -half of the diameter. It is the distance from the circle center to any point on the circumference.
Use the formula c=d(pi)
The radius is half of the diameter. The radius of a circle is the distance from the centre to the circumference. The diameter of a circle is the length of a straight line from one point on the circumference to another, passing through the centre of the circle.