2r+pi r
2 pi r = circumference. 1/2 of that is pi x r. pi is 3.142
If the semicircle is placed on 1 side of the rectangle:Find the total perimeter(circumference) of the side opposite to the one with the semicircle's base and the 2 sides perpendicular to the semicircle's base.The formula for circumference of a circle is 2πr.Thus for the semicircle we will take the circumference as πr.Find the sum of 1st and 2nd points. This is the final answer.
Half the Circumference + the DiameterCircumference of a circle = pi X d ,so perimeter of a semi-circle = (3.142 X Diameter) + Diameter
It is: (pi*radius)+(diameter)
There is no circumference of a cone, but, we only do the circumference of the circle. the formula for the circle is pi times D. D= Diameter
If you are given the diameter 'D' of the circle: the full circumference is (pi times D) the perimeter of the semicircle is half this plus the diameter Therefore: Pi x D /2 + D
Circumference of a circle = (pi) x (diameter)
You can multiply the radius by pi to get the length of the semicircle.
diameter times 3.14159
Divide the circumference by 2*pi because 2*pi*radius = circumference
3.14 to the 2 power
PI times the DIAMETER