The formula for a right triangle is due to the Greek Pythagoras. It is named the Pythagorean Theorem after him. The formula is x^2+y^2=z^2, where x and y are the two legs of the right triangle and z is the hypotenuse. The hypotenuse is the side opposite the right angle. A right angle is an angle with 90 degrees. The other two angles will add up to 90 degrees because the angles in all triangles add up to 180 degrees.
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By using Pythagoras' theorem for a right angle triangle.
The hypotenuse of an isosceles right triangle is 13 centimeters long. How long are its sides?
Arturo Pythagoras
90 degree
The general formula for a triangle is Base x Height / 2. That applies quite easily for a right angle triangle.