They are directly proportional.
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Yes because: circumference/diameter = pi and circumference = pi*diameter
The circumference is pi times the diameter.
Circumference = diameter x pi
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.
The relationship of a circles circumference to it's diameter is Pi x diameter. So a 1cm diameter circle will have a circumference of 3.142 cm to the third d.p.