Mark drew perpendicular lines.
"It is a straight curve that does not have a thickness, and it extends endlessly in both directions."
"A right angle is an angle that is exactly equal to 90 degrees in measure."
For given example,
Let Mark drew two lines L1, L2 that form a right angle as shown in following figure.
We know, when two distinct lines intersecting each other at a right angle are known as perpendicular lines.
Therefore, Mark drew perpendicular lines.
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