mrs.perkins
If the radius of a circle is multiplied by 4, then how many times larger is the circumference of the new circle?



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Monkeyball
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The circumference of a circle is given by
\[2*\pi*r\]

Monkeyball
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and lets say we pick r=1 we get
\[2*\pi\]

Monkeyball
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now lets say that we multiply the radius by 4 so now r=4

Monkeyball
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\[8*\pi\]

Monkeyball
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8 pi is 4 times bigger than 2 pi

mrs.perkins
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so whats the answer

Monkeyball
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Look at my last post

mrs.perkins
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so what do i do next

mrs.perkins
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so is 32

Monkeyball
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wait can you tell me what the original radius equals?

mrs.perkins
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i really dont know

Champs
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Answer is 4

mrs.perkins
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thanks