Question

The tip of a 12-inch wiper blade wipes a path that is 30 inches long. What is the angle of rotation of the blade in radians to the nearest tenth?

Answer 1

Calculate the circumference of the circle.

Calculate the ratio of the arc sweep of the circle in radians.

Answer 2

so you calculate both number

Answer 3

The circumference is C = 2 (pi) r or 24 pi

Answer 4

The arc sweep is 30 inches

Answer 5

The ratio is 30 inches / 24 pi = 30 / 75.398 = 0.3979ths of the circle

Answer 6

so you round of right

Answer 7

I round just for typing, I usually carry it all on the calculator....

Convert 0.3979 of a circle to radians

Answer 8

Okay thank you so it would be 0.4

Answer 9

No you need to express 0.3979 of a circle in radians

Answer 10

i got it 1.3

Answer 11

A circle is 2 pi radians so 0.3978 * 2 is 0.796 pi

I don't like working in radians since I have never been very good at it.

Answer 12

I got you as close as I can figure out, sorry.

Answer 13

it okay thank you