Let the right-angle side = x, x2+x2 = 20 2, 2x 2 = 400, x 2 = 200, x = 10, and the radical 2 is selected as A.
I remember later, in an isosceles right triangle, if the right side =a and the hypotenuse = root number 2 * a.
If hypotenuse =a, right angle =a/ root number 2.
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