SOLUTION: The circumference c of a circle varies directly as its diameter d, which may be expressed by the equation c=kd. If the circumference of a circle with a 10-inch diameter is given as

Question 1109384: The circumference c of a circle varies directly as its diameter d, which may be expressed by the equation c=kd. If the circumference of a circle with a 10-inch diameter is given as 31.416 inches, what is the circumference of a circle whose diameter is 8 inches.
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
c = kd
:
31.416 = k * 10
:
k = 31.416 / 10 = 3.1416
:
c = (3.1416) * 8
:
c = 25.1328
:
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the circumference of a circle whose diameter is 8 inches is 25.1328
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