You use the equation a²+b²=c²
c = the hypotenuse
a and b represents the legs
Here are two examples
Example 1
Side a = 6
Side b = 8
6²+8²=c²
Square the legs
36+64=x²
Sdd
100= x²
Now we use the square root to find x
√100=√x
Solve the square root
10 = x
Example 2
side a = 3
hypotenuse = 7
3²+x²=7²
Square the known numbers
9+x²=49
Subtract 9 from 49
x²=40
Find the square root
√x=√40
x= 6.32 or 2√10
Hope this helps :)
