00:01
The length of the diagonal is 25 centimeters and the length of the altitude is 15 centimeters.
00:04
Find the area of the trapezoid.
00:06
So first of all, i can find the hypotenuse of this right triangle here.
00:13
And i can say, okay, 15 squared plus b squared or e to d squared.
00:20
We'll call it.
00:22
So let me erase this.
00:24
We'll call this e to d squared.
00:27
E to d because that's the length going from here to here.
00:33
Equals 25 squared.
00:38
So 15 squared is 225 plus e to d squared equals, that's my calculator there for a second.
00:54
25 squared is 625.
01:01
So then c to d squared, 625 minus 225 equals 400.
01:07
Then i'm going to find this, not c to d, it's e to d.
01:10
Then i'm going to find the square root of 400 and that is 20.
01:18
So e to d equals 20.
01:21
Okay.
01:22
So going from here to here is 20 centimeters.
01:26
Okay.
01:28
So i know that 20 centimeters minus x is going from here.
01:37
I'm going to change my color.
01:40
Is going from here to here...