Everyone wave to our good friend, the distance formula

You can use that formula to find out the length of the sides, if two sides are the same, then the triangle is isosceles, if you need more help understanding finding the lengths then you can just ask.

Now how do you find out if it's a right triangle? To do that, we can use an even better friend of mathematics, the pythagorean theorum.

You have to find the lengths of the sides, and then substitute them in, if the equation is correct, then you have a right triangle.