How do i solve this?

Question

Answer 1

the 3rd side can't be greater than the sum of the other 2 sides

3rd side < 11+13 inches

3rd side < 24 inches

if the 3rd side were exactly 24 inches, the triangle collapses into a "degenerate triangle" with angles 180, 0, and 0 degrees. It's a straight line.

Answer 2

The max cant be longer than 24; and you want enough width. So the triangle should have a width of (13+11)/2=12. So stick with 21.