d.with four angles to measure.

hm.. ok – when you are working on BOTH the interior and external angles of a polygon at the same time, you end up with 4 angles – like a cross shape but not 90 degrees each but rather than angles produced by the 1st vertex of the polygon. – like < if it is an angle, could be extended *past* the point and across to the other side... to form a " X " shape - a grid.with four angles to measure."

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