The circumference of a circle is 100. The diameter of this circle is equal to
(A) $100 \times \pi$
(B) $\frac{2 \pi}{100}$
(C) $\frac{100}{\pi}$
(D) $2 \pi \times 100$
(E) $\frac{\pi}{100}$
The circumference, $C$, of a circle is given by the formula $C=\pi \times d$, where $d$ is the diameter of the circle.

If the circumference is 100 , then $100=\pi \times d$ and so $d=\frac{100}{\pi}$.

ANSWER: (C)