Ah, isn't that a lovely question? In a parallelogram, there are two pairs of opposite sides that are parallel, but none of the sides are perpendicular to each other. Perpendicular lines meet at a right angle, and in a parallelogram, the sides do not meet at right angles, they run parallel in a harmonious way. Just like nature, everything has its place and purpose in a parallelogram.
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In a parallelogram, there are two pairs of opposite sides that are parallel to each other. Since parallel lines do not intersect, there are no perpendicular lines within the parallelogram itself. However, if you consider the diagonals of a parallelogram, they are perpendicular to each other, intersecting at right angles. Therefore, there are two perpendicular lines in a parallelogram when you consider its diagonals.
It may have either none, or four. If the angles are ninety degrees, then we have a rectangle, which is a special case of a parallelogram, and each side is perpendicular to the next. For any other set of angles, no sides are perpendicular.
The single altitude of a parallelogram is its perpendicular height
No
A Star has 0 perpendicular lines!
9 perpendicular lines
There can be up to 8 perpendicular lines.