Legs & Base of Triangle, Hypotenuse

This image contains four right triangles, one on each side of the square with the green dot in the center.

A right triangle is a triangle with a right angle.

Also within the right triangle are two legs and a hypotenuse. The hypotenuse is the side across from the right angle, and the legs are the sides connecting the right angle.

This right triangle is also an isosceles triangle. The hypotenuse is also the base.