SOLUTION: the area of a circle is equal to the area of a rectangle of 12m*6m, find its circumference???

Question 821251: the area of a circle is equal to the area of a rectangle of 12m*6m, find its circumference???
Answer by LinnW(1048) (Show Source): You can put this solution on YOUR website!
C=(pi)(2r)
A=(pi)r^2
Solve for r in the second equation.
A/(pi) = r^2
Take square root of each side.
sqrt( A/(pi) ) = r
Substituting in C=(pi)(2r) we have
C=(pi)(2( sqrt( A/(pi) ) )) or
C=
A in the equation for our problem is l x w = 12*6 = 72
so
C=
=
=
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