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.
A Diamond does not have any perpendicular lines.
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I don’t know
A trapezium has no right angles therefore there are no perpendicular lines. If it had perpendicular lines, it would be a square or rectangle.
A 9 sided nonagon normally has no perpendicular lines that meet at right angles
Perpendicular lines meet at 90 degrees
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Not sure what a dimond is but a diamond has no perpendicular lines.
The cut of a diamond may contain perpendicular lines. The mineral diamond may also have natural perpendicular lines in the lattice, and these are not visible in gem-stone quality diamonds.
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.
A trapezium has no right angles therefore there are no perpendicular lines. If it had perpendicular lines, it would be a square or rectangle.
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9 perpendicular lines
A Star has 0 perpendicular lines!
Including its diagonals there are 6 perpendicular lines
A trapezoid has 2 parallel lines. It may or may not have perpendicular lines.