00:01
Okay, so we're going to use heron's formula.
00:05
That formula looks like this.
00:07
The big square root, and it's s times s minus a, times s minus b, times s minus c.
00:15
A, b, and c are the sides of the triangle.
00:18
S is what we call the semi -perimeter.
00:23
And we get the semi -perimeter by adding the three sides together and dividing by two.
00:30
So we're going to add 21, 11, and 27, and divide that by 2.
00:38
So 21 plus 11 plus 27, that's going to give me 59 divided by 2 is 29 .5.
00:52
So that's your answer for a, 29 .5.
00:59
Now for b, we want to calculate that area.
01:02
So let's put this all into our formula.
01:06
We want 29 .5 times 29 .5 minus 21, 29 .5 minus 11, 29 .5 minus 27...