Which of the following sets of side lengths cannot form a right-angled triangle?
Q1. Which of the following sets of side lengths cannot form a right-angled triangle?
Answer: 9cm, 5cm, 7cm
Explanation: For a right triangle, a²+b² = c²; for 9,5,7: 81+25 = 106 ≠ 49, so these sides cannot form a right-angled triangle.