A 9 sided nonagon normally has no perpendicular lines that meet at right angles
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.
No, it is not.
In a regular nonagon no two sides are parallel.
The question doesn't quite make sense as stated. A regular nonagon has nine sides and each side has a unique perpendicular bisector - there are 9. A regular n-gon has n perpendicular bisectors of sides, if n is odd. If n is even, then there are only n/2 since opposite sides share the same perpendicular bisector.
A nine sided nonagon has 27 diagonals
Octagons have no perpendicular lines.
There are four perpendicular lines in a rectangle
An octahedron has 7 perpendicular lines.
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.
nonagon
A trapezium has no right angles therefore there are no perpendicular lines. If it had perpendicular lines, it would be a square or rectangle.