Yes they always do! They are not Perpendicular if they don't.
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The Right Triangle. Perpendicular lines make a right angle.
perpendicular crosses at a right angle, while intersecting lines don't
NO, because each intercecting line does not make a right angle-some could make acute or obtuse angles. To be perpendicular the lines that meet have to make a right angle(90 degree angle) or else they will not be perpendicular.
Right angles are formed by perpendicular lines. If the lines would extend, to make two intersecting lines, they would form four right angles. Perpendicular lines are written like this: . From its shape, you can already tell that it forms at least two right angles.
A right angle which is ninety degrees or 360 degrees which is a revolution.