SOLUTION: Good day to you! I am solving word problems which involve direct proportion or direct variation wherein k = y/x but I doubt my answers, can you please help me? Thank you very muc

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Question 684549: Good day to you! I am solving word problems which involve direct proportion or direct variation wherein k = y/x but I doubt my answers, can you please help me?
Thank you very much!
The circumference C of a circle varies directly as the length of the diameter.
If C = 15.7 when d = 5, find d when C= 28.26
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

formula is: C=pi%2A+d...=>...d=C%2Fpi
when C=+28.26..=>...d=28.26%2F3.14..=>...d=9