HOw would i find the circumference of a circle with a radius of 3in to the nearest hundredth?

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HOw would i find the circumference of a circle with a radius of 3in to the nearest hundredth?

2006-10-11 05:13:05 · 2 answers · asked by crazybrunette1991 2 in Science & Mathematics ➔ Mathematics

2 answers

Circumference of a circle formula

C = 2πr

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C = 2(3.141592654)(3)

C = 6.83185307(3)

C = 18.84955592 in

C = 18.85 in rounded to two decimal places

The answer is C = 18.85

2006-10-11 05:34:07 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋

Circumference is just pi (3.141592653...) times diameter. And diameter is twice the radius.

So you just need to figure:
C = pi * d
C = pi * (2 * r)
C = pi * (2 * 3)
C = pi * 6
C = 3.14159 * 6
C = 18.84954 inches.

Now round that to the nearest hundredth:
The circumference is 18.85 inches.

2006-10-11 05:19:09 · answer #2 · answered by Puzzling 7 · 0⤊ 0⤋