Circumference or perimeter = 2*pi*radius or pi*diameter
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Half the Circumference + the DiameterCircumference of a circle = pi X d ,so perimeter of a semi-circle = (3.142 X Diameter) + Diameter
The boundary or perimeter of a circle is called the circumference. The formula for calculating the length of the circumference is C = 2πr.
In a circle of radius, r, perimeter of quadrant = pi*r/2 + 2r = r*(pi/2 + 2)
To find the circumference (distance around) of a circle, use the formula pi x d (d=diameter)
this is called finding the circumference. The formula is 2*pie*radius