If the diameter of a circle changes from 5 cm to 15 cm, how will the circumference change?
A. Multiplies by 1/3
B. Multiplies by 3
C. Increases by 10
D. Decreases by 10

Please help and give the CORRECT answer. Thanks!

Respuesta :

The answer is B. I solved it all out on paper so you can understand how I got it.
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