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When d=diameter and r=radius d=2r or r=1/2d
The mathematical relationship between the circumference of a circle and its diameter is given by the formula C = π * d, where C represents the circumference, d represents the diameter, and π is a constant approximately equal to 3.14159. This formula shows that the circumference is equal to π times the diameter of the circle. This relationship is fundamental in geometry and is used to calculate the circumference of a circle when the diameter is known.
As a cone will always have a base which is a circle, the relationship between the diameter and radius remains constant with that of a circle at any point of the shape. The radius is always 1/2 of the diameter. To figure out the volume of a cone you must first work out the radius, for the formula is: (1/3) x Pi x R^2 x h ^2 = Squared
the circumfrance of the base x the height of the cylinder
π is the ratio between the diameter and the circumference of a circle so the formula would be : Circumference = π x Diameter or alternatively (since the radius is half the diameter) Circumference = 2π x Radius.