if the sum of the two smaller sides is ≤ the largest side
... a triangle cannot be made (won't close up)
For each sets of lengths determine if it is possible or not to form a triangle:
1) AB = 4 cm, BC = 6 cm, AC = 12 cm
2) AB = 2 cm, BC = 8 cm, AC = 5 cm
2 answers
actually, the largest side must be less than the sum of the two smallest sides.