A triangle has side lengths of 7 cm, 1 cm, 9 cm. How many triangles are possible?

Answer 1

none. each side must be less than the sum of the other two.

9 is too long. The sides of 7 and 1, laid down completely flat don't reach from one end to the other.

Answer 2

A triangle has side lengths of:
6 inches
6 inches
Any length less than 12 inches.
How many triangles are possible?