What is circumference?
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Circumference of the circle or perimeter of the circle is the measurement of the boundary of the circle. ... If we open a circle and make a straight line out of it, then its length is the circumference.
Perimeter of semi-circle: πr + 2r
Area of semi-circle: πr2/2
Area of circle: πr2
Circumference of Circle: 2πr.
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In geometry, the circumference is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length around any closed figure.
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