All I can say is... what?
2006-11-01 03:10:49 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2 pi = 1 revolution
80/5 = 16 pi
C = pi D
16 pi = D pi
16= D
2006-11-01 04:10:48 · answer #1 · answered by davidosterberg1 6 · 0⤊ 0⤋
Well, the formula for the circumference of a circle is diameter * pi, so...
if the wheel rolls 5 times, we know that 5 circumferences is 80 pi, thus one circumference is 80 pi / 5 = 16 pi
Since 16 pi is the circumference, which is (by definition) diameter * pi, the diameter is 16 feet.
2006-11-01 11:14:34 · answer #2 · answered by disposable_hero_too 6 · 0⤊ 0⤋
16
80 x pi = 251.2
251.2 / 5 revolutions = 50.24 = circumference of the circle
circumference of a circle = pi x diameter = 50.24
diamter = 16
2006-11-01 11:15:56 · answer #3 · answered by cboykin18 2 · 0⤊ 0⤋
80pi feet = 5 times circumference
circumference = 16pi feet
diameter = circumference / pi = 16 feet
2006-11-01 11:12:49 · answer #4 · answered by sunil 3 · 0⤊ 0⤋
circumference=pi*d
5*pi*d=80*pi
d=16ft
2006-11-01 13:45:40 · answer #5 · answered by yupchagee 7 · 0⤊ 0⤋