10, A decagon has a maximum of five pairs of perpendicular lines, and a maximum of 5 parallel lines. however, this isn't in black and white it can have no pairs of line either perpendicular or parallel
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A decagon has ten sides - from the Greek word 'deka' meaning ten.
A regular decagon has 10 sides. See link.
A rhombus has no perpendicular sides but its diagonals are perpendicular to each other and meet at right angles.
An undecagon has eleven sides. That means that it has more sides than a decagon and fewer sides than a dodecagon.
Decagon