Not sure what a dimond is but a diamond has no perpendicular lines.
A diamond has two pairs of parallel lines.
A right angle has no parallel lines, but it does have perpendicular lines that meet at right angles.
It need not have any.
There are 20 common points.
A trapezoid has 2 parallel lines. It may or may not have perpendicular lines.
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.
Not sure what a dimond is but a diamond has no perpendicular lines.
A diamond has two pairs of parallel lines.
None but it does have perpendicular lines
A parallelogram has 2 pairs of parallel lines and in the form of a rectangle it has 2 pairs of parallel lines and 4 perpendicular lines that meet at each of its corners at right angles.
There are 2 sets of parallel lines.
A right angle has no parallel lines, but it does have perpendicular lines that meet at right angles.
It need not have any.
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
There are no parallel lines in any triangle but a right angle triangle has perpendicular line that meet each other at 90 degrees.
Perpendicular lines = lines which are at right angles (90 degrees) to each otherDiamond = 2 pairs of parallel lines