Which of the following is not one of the sides of a right-angled triangle?

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(A) 9cm, 5cm, 7cm
(B) 9cm, 12cm, 8cm
(C) 3cm, 1cm, √5cm
(D) None of these

🧠 Explanation (Math):

Given: Identify sides that are not of a right-angled triangle
Step 1: Check Pythagoras: 5² + 7² = 25 + 49 = 74
Step 2: 9² = 81 ≠ 74 ⇒ not right-angled
Final Answer: 9cm, 5cm, 7cm