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Calculate the length of the third side in the given right-angled triangle.

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12 cm

9 cm

15 cm

8 cm

answer is B.

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Detailed Solution

From the Pythagoras Theorem, we have

AC² = AB² + BC²

⇒ (15)² = AB² + (12)²

⇒ AB²= 225 − 144 = 81

⇒ AB = 9 cm

Hence, the length of the third side is 9 cm.

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