00:01
And you're given the sign lengths of a triangle.
00:02
The first thing we want to do is find the area of it, and we use heron's formula.
00:07
So the first thing we need to know is what is this value of s? so we add up all the three sides.
00:12
So in other words, we're going to do 125 plus 160 plus 225, and we're going to divide it all by 2.
00:26
Now, sometimes it could be a decimal.
00:28
Sometimes it might not.
00:29
In this case here, it gets a whole number.
00:31
Number of 255.
00:34
So the s is now used in here.
00:36
So each of these here is an s.
00:38
Then we'll subtract a, b, and c or the side lengths from there.
00:42
So to find the area, this will be in square yards, it'll be the square root of 255 times we're going to do 255 minus 125, which is 130.
00:56
Then for the second one, we'll do 255...