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Math

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What is the approximate circumference of a circle with a radius of 6 centimeters?
A.12
B.18
C.24
D.36
My teacher says it's D and I agree but for the next question he says it's 12 and aren't these two questions the same?

What is the circumference of the circle below?

The circle shows a radius of 6 yards and doesn't show anything else.
A.6
B.12
C.18
D.36
He says it's B but I thought it was D because both these questions look the same.

Can someone explain to me?

  • Math -

    They both look the same to me, too.

  • Math -

    For both problems the diameter would be 12 is that why he said it was B for the second problem?

  • Math -

    I don't know.

  • Math -

    What's the approximate circumference of the circle with a 16 cm

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