00:01
So for this question, they're saying the width of a rectangle below is 6.
00:05
So i'm going to make this 6 centimeters and it's perimeter.
00:10
So we know the perimeter is going to be 42.
00:12
And i want to find the area.
00:15
All right.
00:15
So first thing i need to do is find all the sides.
00:17
So if this is 6, i know that this has to be 6.
00:20
And i don't know what this is.
00:22
So i'm just going to make it x.
00:23
Now when i find perimeter, when i add up all the sides, it gives me perimeter.
00:27
So i'm going to add all these up.
00:28
So it'll be x plus x, which is 2x.
00:32
Plus 6 plus 6, which is 12, equals 42.
00:36
I'm going to solve for x, subtract 12.
00:42
I get 2x equals 30.
00:45
So it must mean that x, oops, divide by 2...