A trapezium has no right angles therefore there are no perpendicular lines. If it had perpendicular lines, it would be a square or rectangle.
up to four pairs is the answer
Diamonds come in all shapes and sizes, which determine the number of perpendicular lines (assuming you are referring to the edges as the lines) so there is no one number of lines or perpendicular lines on a diamond.
Perpendicular lines meet at 90 degrees
24
It is possible for all nine lines to be perpendicular to at least one other line.
A nonagon is a nine-sided polygon. In a nonagon, each vertex can have two perpendicular lines passing through it, resulting in a total of 18 perpendicular lines in a nonagon. This is because each vertex can have one vertical and one horizontal line passing through it, which are perpendicular to each other.
No, it is not.
In a regular nonagon no two sides are parallel.
A nine sided nonagon has 27 diagonals
Octagons have no perpendicular lines.
An octahedron has 7 perpendicular lines.
There are four perpendicular lines in a rectangle
Each of the four lines is perpendicular - to two of the other lines.
Not sure what a dimond is but a diamond has no perpendicular lines.
A trapezium has no right angles therefore there are no perpendicular lines. If it had perpendicular lines, it would be a square or rectangle.
In general, none, but there can be nine.