Question

You have the side lengths 3 in., 6 in., and 10 in. Can these side lengths form a triangle

Answer 1

No they cannot because 3 is way to short

Answer 2

These side lengths cannot form a triangle.
To form a triangle the two shorter sides have to be greater than the biggest side.
3 + 6 = 9
9 < 10
This makes it impossible to form a triangle with these lengths