If angle A = 45 degrees, then angle B is also 45 degrees.
This means that the legs are also equal, that is, BC = AC = 2.
Following the Pythagorean theorem (the square of the hypotenuse is equal to the sum of the squares of the legs), we find the hypotenuse AB.
AB˄2 = (2) ˄2 + (2) ˄2;
AB˄2 = 8 +8;
AB˄2 = 16;
AB = 4 cm.
Answer: 4 cm.
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