Well they shouldn't, because the whole point of a triangle it that it has three opposing side therefore the angle between two sides will be opposite the third side. It's easier to show on a diagram.
C
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B c A
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A triangle, no matter the type, can never have any parallel sides. To try this out, draw any two parallel lines on a sheet of paper and try to make a triangle out of it.
It can have 0, 1 or 2 pairs of parallel lines.
None.
NoneOctagon hasn't got any pairs of parallel line
NO! It only has 1 pair of parallel lines. 1 Remember 1! Not 2, 1! Got it? Good! :) Now remember again, always listen to your teacher, and never slouch so that you would fall asleep in class. REMEMBER! 1 is the answer