The proper term for an 11 sided polygon is a hendecagon (undecagon is a mix of latin and greek roots) and you can triangulate it with as many triangles as you like. There is a minimum number of triangles though. The smallest i could get is 9, but you might be able to get it smaller
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An undecagon is an 11 sided polygon
An undecagon is an 11 sided shape and its interior angles add up to 1620 degrees
An undecagon, or figure with 11 sides. has an interior angle of 147o
undecagon.
A heptagon has 5 triangles.