00:01
The first thing i did is i plotted points d, e, and f on a coordinate plane, and i connected them to create a triangle.
00:08
To find the perimeter of a triangle, we need to know the length of each side.
00:12
Let's start with side e .d.
00:16
Since e .d is a vertical segment, we can count boxes between points e and d to find its length.
00:24
We count the boxes and we get e .d equals five units.
00:29
Next, we are going to use the distance formula to find ef and fd.
00:35
The distance formula is in the top right corner of the screen.
00:39
Ef equals.
00:41
Let's use the coordinates of points e and f and plug them into the distance formula.
00:48
First, we are using the x coordinates, 2 minus negative 2 to the second power, plus, now we're going to use the y coordinates, negative.
01:03
1 minus 3 to the second power.
01:07
Let's simplify the expression under the square root.
01:10
2 minus negative 2 is 4, so we have 4 to the second power, plus negative 1 minus 3 is negative 4, so we have negative 4 to the second power.
01:21
4 to the second power is 16, and negative 4 to the second power is also 16.
01:28
16 plus 16 is 32, so we have square root of 32.
01:34
Use a calculator to figure out square root of 32 and round the answer to the nearest tenth.
01:40
So we get 5 .7 units.
01:47
We will repeat the process to find the length of df.
01:52
We are going to use the coordinates of points, d and f, and plug them into the distance formula.
02:00
2 minus negative 2 to the second power plus negative 1 minus negative 2.
02:13
To the second power.
02:17
We simplify the expression under the square root...