What is formoula of circumference
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C=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 figureThe formula for circumference = diameter × π
Perimeter of semi-circle: πr + 2r
Circumference of Circle: 2πr
Area of semi-circle: πr2/2
Area of circle: πr2
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