00:01
I think the teachers is just trying to be tricky here, that they give you a diameter of 10.
00:07
Now, remember that that means that the radius is 5.
00:12
And not sure if you need the unit circle on this, but 5, 4.
00:18
Whoops, it is not 5 5 over 4.
00:20
It is 4 power 5.
00:22
You know, look something like this.
00:26
And if you extrapolate that unit circle, it goes over here.
00:31
Don't want the whole thing, they just want that section.
00:35
And if you think about, well, what is area of a circle? well, area of a circle is equal to pi r squared, but you don't want the whole circle.
00:44
You only want that portion.
00:48
So this is area of a circle.
00:50
But here, if we want area of a sector, you want to do that 4 pi over 5, and you want to divide by 2 pi...