In a triangle XYZ, if XZ = 9 cm, YZ = 12 cm, and XY = 15 cm, is it a right-angled triangle? Justify your answer.
Yes, because it satisfies the Pythagorean theorem.
No, because the sides are not in the ratio 3:4:5.
Yes, because the sum of the squares of the two shorter sides equals the square of the longest side.
No, because the angles are not given.
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