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a formula that uses pi is the circumference and area of a circle and every polyhedron that has a circle
the circumference formula uses pi and the formula is pi (3.14) times what ever the diameter is and that's one formula i know and I'm in fifth grade
Pi = circumference/diameter
you can use 2 formulas... 2 x pi x radius or pi x diameter - dont forget that pi is always 3.14 unlsess said otherwise. :) hope this has helped.......
use the formulas pi*diameter 3.14*72 then simplify 226.08