Usually none, but all ten can be perpendicular.
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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. know write the answer clearly
A Star has 0 perpendicular lines!
9 perpendicular lines
There can be up to 8 perpendicular lines.
0 perpendicular lines. There are no 90 degree angles within a hexagon. Perpendicular lines meet at a right angle and sometimes they intersect.