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That the slopes of the lines are the opposite of each other and negative.

Ex: y=2/3x+b then the line perpendicular to it is y=-3/2+b

Q: How can you tell which lines are perpendicular?

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Obviously it can.The type of lines that are perpendicular but do not intersect are known as 'Skew' lines. These can be better understood by using vectors in three-dimensional.I have reason to think that you yourself, do not know what your asking for and therefore I must tell you this. 90degrees= perpendicular.

PERPENDICULAR

perpendicular.

These lines are perpendicular: _|

Lines that aren't perpendicular

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= parallel + perpendicular As such no, perpendicular lines do not naturally have parallel lines. However...connect the lines in the symbols below. ++ ++ And you'll have 4 perpendicular lines, and 4 parallel lines.

Perpendicular lines intersect.

Obviously it can.The type of lines that are perpendicular but do not intersect are known as 'Skew' lines. These can be better understood by using vectors in three-dimensional.I have reason to think that you yourself, do not know what your asking for and therefore I must tell you this. 90degrees= perpendicular.

PERPENDICULAR

perpendicular.

These lines are perpendicular: _|

Lines that aren't perpendicular

Lines that intersect at 90 degrees are perpendicular lines

A rhombus has parallel lines but no perpendicular lines.

Octagons have no perpendicular lines.

I believe they do, and they have 2 perpendicular lines.

No. If the lines are parallel they will never meet or intersect at any point. If the lines are perpendicular they do intersect, but perpendicular lines are a special case of intersecting lines. Perpendicular lines are exactly 90 degrees from each other. Intersecting lines do not haveto be perpendicular... but perpendicular lines are always intersecting.