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No they are perpendicular if the intersect at a right angle. + is perpendicular, = is parallel
The opposite is perpendicular (a straight line that hits another at a right angle).
Normally none but it does have perpendicular lines that meet at right angles.
An isosceles right angle triangle fits the description
Most shapes have no line of symmetry and no right angle. Look at your hand, feet, face or body (the last two are only nearly symmetrical), the keyboard, the monitor.