5cm
13^2-12^2=25
C^2 = 25
C = 5
To solve these problems you need to use the quadratic formula which is listed below.
So, if you take #2.
The
has a 1 in front of it. The x has a -3 in front of it. The last number is also -3. So:
a = 1
b = -3
c = -3
Then you can plug all of these into the equation and simplify. Which gives you:
180 feet, cause you have already covered half the square