It should be called a decahexagon, though I've never seen it in print.
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A quadrilateral is a closed 2-dimensional shape bounded by four straight sides.
It is called a right angle triangle.
For any 2D shape, the interior angle (IA) is equal to the number of sides (n) minus 2 multiplied by 180 IA = (n-2)*180 For a heptagon this is 900
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