00:01
We now determine the perimeter of this figure.
00:04
This figure is basically a sector of a circle.
00:08
And so to determine the perimeter, we go around this figure once.
00:11
That is, if you start from one position on the figure, we go around this figure and come back to the same position.
00:18
So let's do that to calculate the perimeter.
00:20
I'm going to start from this position and go around this figure once and come back to the same position.
00:26
So i travel this distance, that is, across the radius of the sector.
00:31
Of the circle, which means first i cover the distance arc.
00:35
And then i go along this arc of the sector of the circle.
00:40
That is, i cover the length of arc of the sector of the circle, which is usually represented by l.
00:47
So i cover this arc length.
00:51
And then from here, i cover the distance of radius r one more time.
00:57
So i come back to the same position like this.
00:59
And so we can write the perimeter equation for this figure.
01:04
Perimeter.
01:08
This equals, first we cover the radius r.
01:11
So i put radius r and then we cover the length of the arc which is represented by l.
01:17
Or this is usually called this arc length plus we covered another distance r...