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i want to Calculate this area Equation :

A= pi *(D^2*d^2)*p*n*k

n= 0.5

k=0.4

but the Valuable of ( D-d-p) given like this :

D:d:p

4 1 4

My question is :

i dont understand Valuable of ( D-d-p)

is it Number or proportion ... just can any one make it clear to me

Please, Please, Please,

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# A simple question

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