Which side lengths could be used to form a triangle?

2 cm, 3 cm, 12 cm

15 cm, 7 cm, 5 cm

14 cm, 20 cm, 32 cm

10 cm, 25 cm, 15 cm

1 Answer

  • If you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. If that is not true, then it is not possible to construct a triangle with the given side lengths. Example: Determine if sides of length 5 cm, 8 cm and 12 cm can form a triangle?