SOLUTION: the perimeter of a semi-circle is doubled when the radius is increased by 6. Find the radius

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Question 257506: the perimeter of a semi-circle is doubled when the radius is increased by 6. Find the radius
Answer by dabanfield(803) About Me  (Show Source):
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the perimeter of a semi-circle is doubled when the radius is increased by 6. Find the radius
Let R be the radius of the circle. Note that 2*R is equal to the diameter.
Then the perimeter of the semi-cirle is [(2*R)*pi)]/2 = R*pi.
If we increase R by 6 the perimeter is doubled so:
2*(R*pi) = (R+6)*pi
Solve for R.
Use pi = 3.1416.