willcoop527 willcoop527

23-03-2019
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If the diameter of the circle above is 18 in, what is the circumference of the circle?

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daienrode daienrode

23-03-2019

Formula of circle:

C= 2πr

The radius is half of the diameter, so divide 9 by 2

18/2=9

Then plug in 9 as the radius in the formula.

C= 2π(9)

Using you calculator multiply 2 by the symbol "π" and 9

Exact Form is 18π

Decimal Form is 56.54866776...

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