00:01
So we have two circles, and the first circle has a radius of four and an arc length of three pi.
00:15
The second circle is a dilation, and that radius measures 12, and that arc measures 9 pi.
00:27
A says the angle marked b measures 12 over 8 pi.
00:34
B is going to measure because arc length is theta times r, so the angle is going to be arc length divided by radius.
00:44
So that would be 9 pi over 12.
00:47
That angle is actually 3 pi over 4.
00:51
So a is not correct.
00:54
B says the value of b is greater than the value of a by a factor of 3.
01:01
So a is going to measure 3 pi over 4.
01:05
So those measures are equal.
01:08
One is not greater by 3...