Pi is related to the diameter of a circle through the circumference. C=(pi)*d
C = circumference (perimeter of the circle)
pi = constant
d = diameter
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The circumference of a circle divided by its diameter is equal to the value of pi.
Pi (approximately 3.14) is the ratio of the circumference of a circle to its diameter. It is calculated by circumference divided by diameter.
Pi is related to the area of a circle because it just is. It is closely related to it in math, and to find the circumference (PI 3.14), you must know the area or the diameter.
Diameter = circle's circumference/pi
Circumference of a circle: pi times diameter