Pi ( 3.142 approx.) is the amount of times the diameter of a circle can be measured along the circumference of a circle.
We know that Pi multiplied by the diameter of the circle is equal to it circumference. So we write C=PiD This means, as it says above, that a certain number of "Pi's" will be equal to the circumference.
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pi
yes, it is correct perimeter = d * pi pi is the ratio between the perimeter and the diameter
Circumference of a circle is 2 x Pi x the radius
diameter times pi(3.14159) equals cicumference
The circumference is pi times the diameter.