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C= 2pir solve for r
Please help me with this

User Metalshark
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1 Answer

4 votes
C = 2* pi * r ;

is the formula for the circumference of the circle;
in which:
C = the circumference of the circle;
pi , or " π " ; is the symbol for "pi" ;
r = the radius of the circle ;
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To solve for "r" (the radius), divide each side by "2*pi" ;
to isolate "r" (the radius) on one side of the equation;
and to solve for "r" (the radius):
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C = 2*pi*r ;

C / (2*pi) = {2*pi*r} / (2*pi) ;

to get:
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C / (2*pi) = r ;

r = C / (2*pi) .
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