00:01
All right, a bicycle tire has a diameter of 60 centimeters and rotates 300, or excuse me, 33 .3 revolutions per minute.
00:12
How far does the point on the edge of the tire travel in a minute? use 3 .14 for pi.
00:17
So we're thinking, okay, a point on the edge, if it's a revolution, means it's rotating, right? so how far does it travel in a minute, right? how many rotations? okay, so we can figure that out.
00:30
Key piece here is diameter.
00:33
So that's a segment that extends from one end of a circle to the other and passes through the center.
00:38
Now, if we're talking about a revolution, a point going around the edge, we're thinking circumference, right? so circumference, we think 2 pi r, or 2 times radius is diameter times pi.
00:51
Okay, so we can do that...