Which are the possible side lengths of a triangle?

3 cm, 5 cm, 9 cm

4cm, 8 cm, 10 cm

6 cm, 9 cm, 17 cm

8 cm, 10 cm, 18 cm

Answer: 4cm, 8 cm, 10 cm

Step-by-step explanation:

The triangle inequality states that for any triangle, the sum of the lengths of any two sides must be greater than the length of the remaining side. For the given triangles:

3+5 < 9 NO

4+8>10; 10+8>4; 10+4>8 YES

6+9 < 17 NO

8+10=18 NO