1. Which is the diameter of a circle with a circumference of 15 cm?
A. 7.5/π cm
B. 15π cm
C. 15/π cm
D. 30π cm
2. Which statement is true about the circumference of a circle?
A. It is about twice the radius.
B. It is about half the diameter.
C. It is about three times the radius.
D. It is about three times the diameter.
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