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Which set of lengths CANNOT form a triangle?

Class 7Triangle InequalityTriangles
  • A4 cm, 4 cm, 4 cm
  • B3 cm, 6 cm, 7 cm
  • C2 cm, 3 cm, 5 cm
  • D6 cm, 7 cm, 8 cm

Step-by-Step Solution

2 + 3 = 5 is only EQUAL to the third side, not greater, so the sticks would lie flat on a line. The other sets all pass.
Answer: C) 2 cm, 3 cm, 5 cm

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