Add the possible answers so we know all options
Idk, why does the world need problems like this, not like everyone is going to grow up to be a math teacher.
7 = r^1/2 is the same as saying 7 = square root of r. So, to get rid of the square root sign on the r, you need to square it, and when you do something to one side of the equation, you have to do the same to the other side. So after squaring both sides, you get 49 = r.
It depends on which triangle it actually is
