A polygon with side lengths of 6, 9, and 15 forms a triangle.

True

False

I believe the answer is false

Try this: Combine 6 and 9, obtaining 15.

Compare this sum, 15, to the length of the 3rd side: 15.

If placed end to end, the 2 sides with lengths 6 and 9 form a new line of length 15. We'd end up with this new line superimposed on the 3rd side (with length 15).

Think: Do 2 straight lines of length 15, superimposed on one another, form a triangle?