The diameter of a circle or sphere is the length of a straight line that touches both sides and passes through the centre.
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The diameter is the chord (line that goes from the circle to the circle) that goes through the center of the circle. It is the largest chord. It is also equal to twice the radius.
By dividing the circumference by 2*pi will give you the radius and twice the radius gives you the diameter.
you half the diamater to get the radius, then you square the radius. Then you times it by 3.14. Always. example. Diameter=4cm then radius =2cm squared=4cm 4x3.14=12.56
Circumference = pi x diameter 3.5 = 3.1415 x diamater diameter = 3.5/3.1415 =1.114 cm
Pi X D = Circumference. To find Diamater if you know Circumference, divide Circumference by Pi (3.14).