This is excellent. I got both wrong answers (19, 26) before getting the right one. Lovely abstraction leaks.
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Two answers
a) If the number of sides of polygons are to be considered, then,
2+3+(3x11) = 38
b) If the number of polygons to be considered (irrespective of number of sides), then,
2+3+(3X10) = 35
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I think 38 is objectively preferable since it explains more of the data. If you start ignoring details many answers become acceptable.

