a squared + b squared = c squared
a=leg
b=leg
c=hypotenuse
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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?
90 degree
Arturo Pythagoras
The general formula for a triangle is Base x Height / 2. That applies quite easily for a right angle triangle.