Question

A wheel has a diameter of 21 inches.

Approximately how far does it travel in 3 revolutions?









A.
63 in.







B.
65.94 in.







C.
98.91 in.







D.
197.82 in.

Answer 1

i ythink its B

Answer 2

@Data_LG2

Answer 3

In three revolutions it travels three times its circumference.
You need to find the circumference of the wheel and multiply by 3.

Answer 4

Do you know the formula for the circumference of a circle?

Answer 5

First you need to figure out how far it will travel in 1 revolution.
So 21 x pi = ~ 66 inches (circumference) that gives you 1 revolution

Answer 6

no and I thought it was C

Answer 7

Cricumference is 2*pi*r

Answer 8

But you have diameter, so pi*d

Answer 9

\(C = \pi d\)

The circumference of a circle is pi multiplied by the diameter.
You have the diameter; it's 21 inches.
Use 3.14 for pi.
What do you get for the circumference?

Answer 10

I got A

Answer 11

`In three revolutions it travels three times its circumference.`

Answer 12

wait what you guys get

Answer 13

3.14 * 21 is not equal to A
3.14 * 21 must equal a number
What do you get when you multiply 3.14 by 21?

Answer 14

Use a calculator.
3.14 * 21 = ?

Answer 15

65.94

Answer 16

Yes, so now multiply that by 3

Answer 17

197.82

Answer 18

Yeah :)

Answer 19

Great.
That is the circumference of the wheel.
In one revolution, the wheel travels 65.94 in.
In 3 revolutions, the wheel travels 3 * 65.94 in.
Now multiply 3 * 65.94 to find your final ansswer.

Answer 20

ok cool thanks guys

Answer 21

I see; you got it already.
Great!