A dodecahedron has 0 parallel faces
A right angle has no parallel lines, but it does have perpendicular lines that meet at right angles.
none
There are 20 common points.
Normally none but it does have perpendicular lines that meet at right angles.
A dodecahedron need not have any parallel lines.
flaming babies
It need not have any.
A trapezoid has 2 parallel lines. It may or may not have perpendicular lines.
None but it does have perpendicular lines
A dodecahedron has 0 parallel faces
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.
A right angle has no parallel lines, but it does have perpendicular lines that meet at right angles.
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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.
Construction, engineering, drawing, and architecture all use parallel and perpendicular lines. Other than that, it is an important topic because you are learning how to apply the language and tools of mathematics to an intuitive system. These topics have proven important in the history of human kind and also many before you have shown that by learning about parallel and perpendicular lines, one learns how to use math and logic. It is doubtful that you can make a living off of parallel and perpendicular lines, but if you can't understand parallel and perpendicular lines, then I worry about your future.