math q! please help!?

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what is the circumference of a circle if the radius is 19 in?

2007-09-20 15:49:56 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

Circumference=2(pi)r
c=2(pi)(19)
c=38(pi)

2007-09-20 15:54:40 · answer #1 · answered by princess 3 · 0⤊ 0⤋

C=pi times diameter or pi times 2 times the radius

119.32 inches is the circumference using 3.14 as pi.

2007-09-20 15:55:42 · answer #2 · answered by The Faery of P 2 · 0⤊ 0⤋

Pi times the diameter. The radius is half the diameter.

19*2=38
38*3.14=119.32 inches

2007-09-20 15:57:07 · answer #3 · answered by phrog_1975 3 · 0⤊ 0⤋

C = pi * d

D = 2r

C = 2pi* r

2* 19 * pi = 38 pi or approximately 119.32 in.

2007-09-20 15:53:46 · answer #4 · answered by lhvinny 7 · 0⤊ 0⤋