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Curves yes, straight lines no
Two curves which intersect at right angles, ( the angle between the two tangents to the curve) curves at the point of intersection are called orthogonal trajectories. The product of the slopes of the two tangents is -1.
There are none. Those two curves do not intersect.
The answer could be "intersect". If not, please edit the question to include more context or relevant information, and then resubmit.
Every polygon has two of its sides intersect.