00:01
So suppose i'm given area is one half times theta times r squared.
00:04
And this is coming from a circle where r is my radius, distance from the center to the outside, and theta is my central angle.
00:13
Okay, so let's say radius is two meters squared, and i also know that theta is pi over four.
00:23
So then what am i solving for here? i'm solving for the missing variable a.
00:28
A will be one -half times pi over four.
00:31
Times 2 squared.
00:33
2 squared will be 4.
00:35
So this will actually cancel.
00:37
So this means pi over 2 will just be my area.
00:40
That is going to be my missing variable.
00:43
Then in my second problem, okay, i have s.
00:47
What is s? well, s is the same thing as arc length, which is r times theta, right? this is the part of the circumference of the circle that covers theta.
00:57
Okay, so if i know that s is 12, in my radius is 250 centimeters.
01:05
Okay.
01:07
So i'm going to need to convert centimeters to inches...