 Welcome geometry students to another example of special right triangles 45 45 90 and I'm going to label each side of the Triangle when you have a 45 45 90 you need to remember that the sides go with x x and x root 2 So in our first example X is going to be 8 because these two legs are Equal to one another and why Will be 8 root 2 so as simple when we have the legs We just choose x as both legs are the same and we throw a root 2 on it to get our answer now for the second example We are given the hypotenuse so that's on the side that we would label as x root 2 So it's pretty easy to see that x must be 10 So the two legs in our second example are again equal to each other and they are both equal to 10 So you need to work on remembering this little rule down here of xx x root 2