A 45-45-90 isosceles right triangle has a side 1 length of 20. Calculate side 2 and Hypotenuse:

√2/2,√2/2,1

Side 2 = Side 1

Side 2 =

Hypotenuse = Square Root(Side 1

Hypotenuse = Square Root(20

Hypotenuse = √400 + 400

Hypotenuse = √800

Hypotenuse =

Therefore, our isosceles 45-45-90 triangle sides are 20, 20, 28.2843