Which set cannot form a triangle? 7, 8, 9 6, 7, 8 5, 5, 6 5, 6, 11
- 7, 8, 9
- 6, 7, 8
- 5, 5, 6
- 5, 6, 11
Explanation
Triangle rule: sum of any two sides must be > the third side.
7, 8, 9: 7+8 > 9, 7+9 > 8, 8+9 > 7 ✓
6, 7, 8: 6+7 > 8, 6+8 > 7, 7+8 > 6 ✓
5, 5, 6: 5+5 > 6, 5+6 > 5 ✓
5, 6, 11: 5+6 = 11, which is not > 11 ✗
Last verified on 07-06-2026
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