multiple the diameter by 2 to get the radius, then use your equation and go from there
the radius is half the diameter
The radius is half the diameter.
Radius = Diameter/2.
the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi
I guess you mean:"How do you find the radius if you are given the diameter?"You take the diameter and divide it by 2.
Radius of a circle = diameter/2
divide diameter by 2 = radius
The radius is one half of the diameter. If the diameter is 20, the diameter is 10.
radius is half diameter...so divide diameter by 2!!!
The diameter by definition because a diameter of a given object is twice its radius.
The diameter of the semicircle will be twice the radius.