0.5*11*(11-3) = 44
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The interior angles of an 11 sided polygon add up to 1620 degrees
1188 of them.
Two
You don't - you need additional information. Many different rectangles can have the same diagonal. If you know the diagonal and one side (which must be LESS than the diagonal), you can use Pythagoras' Theorem to calculate the other side.
9 diagonals