Question

Could the numbers 9,10,19 be a triangle

Answer 1

I wasn't sure if you meant centimeters, inches or degrees. But since I don't know, I'll answer all three.

Explanation:

Centimeters- Possible

Inches- Possible (Extremely big. I suggest using a big whiteboard to draw out)

Degrees- Impossible (All degrees in a triangle have to add up to 180)