The minute hand of a clock is 3.4 inches long. How far does its tip move in 20 minutes? Give your answer correct to one decimal.
2007-06-09 08:41:15 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
In 20 minutes (1/3 of an hour) the hand traces out 1/3 the circumference of a circle.
Its length is 3.4in, and therefore the distance moved by the tip is:
2pi 3.4 / 3
= 2.27pi
= 7.1 inches to 1dec.pl.
2007-06-09 08:52:35 · answer #1 · answered by Anonymous · 0⤊ 0⤋
7.1 inches
you use pi x diameter so 3.4 x 2 x pi to get the whole circumference of the clock. then you divide the result by 3 to get the distance traveled in 20 minutes as this is one third of an hour
2007-06-09 15:54:26 · answer #2 · answered by giz 2 · 0⤊ 0⤋
The answer is 7.1 inches. C = Pi x D...C=3.14159 x 6.8 inches. Diameter = 2 times the radius = 6.8 inches.
Circumference = 21.3628 inches.
Twenty minutes is one third of an hour. One third of the circumference is 21.3628/3/3 = 7.1209 inches.....the answer is 7.1 inches.
2007-06-09 15:54:08 · answer #3 · answered by Joline 6 · 0⤊ 0⤋
.For this problem you use the formula for the circumference of a circle.
Distance = (20/60) 2Ï * 3.4
Distance = 7.12 in
2007-06-09 15:52:41 · answer #4 · answered by Robert L 7 · 0⤊ 0⤋
(20/60)(6.8"Ï)
2007-06-09 15:51:30 · answer #5 · answered by Mark 6 · 0⤊ 0⤋