0:00
Interesting question.
00:02
This is a composite figure and we need to find its perimeter, exact approximate, and area again exact approximate.
00:09
Let's talk about perimeter.
00:10
So perimeter will be first off if this is seven and this is 12, this is four, this is also seven, this is also four, this is also four.
00:26
So if this is 12 and this is four, so definitely remaining eight is this.
00:33
And yeah this is how it is so the perimeter will be i'm going to highlight whichever i'm going to add so first i'm going to add these four edges because perimeter is some of all the edges so i'm talking about part a parameter and for perimeter i'm going to add the one which i just shaded so that's 7 plus 12 plus 7 plus 12 because this complete is also 12 which will give me 14 plus 24 which is 38 okay that is first part and the second part i'm going to add the one which is in blue so one two and three this is what i'm going to add and all three are four so that will be 38 plus four plus four plus four four times four is four four plus four is twelve and 38 plus 12 is 50 and then i'm going to add the last part which are the curved parts the two semicircle.
01:34
So two semicircle are nothing but one complete circle or anyway, i'm going to add it like the length of the semicircle is pi r because the complete circle is two pi r, so semicircle is pi r.
01:46
So that's pi r plus pi r.
01:48
So that will be 50 plus two pi r.
01:51
And what is r? r will be this, which is half of four, which is half of four, which is nothing but two.
01:58
So 50 plus 2 pi times 2.
02:01
So that will become 50 plus 4 pi.
02:04
This is the required perimeter in inches...