area of a circle pi *r^2
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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.
There is no direct ratio. The area is related to the square of the radius by the factor "pi." A = (pi) r2 (Pi is about 3.1416)
Area of any circle = pi*radius2
Pi (approximately 3.14) is the ratio of the circumference of a circle to its diameter. It is calculated by circumference divided by diameter.
The formula for area of a circle is radius squared times pi. The formula for volume of a cylinder is radius squared times pi times height.