how many triangles exist with the given side lengths? 3 cm, 5 cm, 9 cm
1 answer
No triangle can be formed with side lengths of 3 cm, 5 cm, and 9 cm because the sum of the two shorter sides must be greater than the longest side according to the triangle inequality theorem. In this case, 3 cm + 5 cm is not greater than 9 cm, so no triangle can be formed.