They intersect at 90 degrees
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A plus sign (+) would be a pair of perpendicular line segments.
The lines that meet at right angles are perpendicular to each other.
Some intersecting lines are perpendicular lines.Take any old pair of intersecting lines. If the angles at the intersectionhappen to be 90 degree angles, then the lines are perpendicular lines.
No because perpendicular goes up and down
I think it is either a right triangle, square, pentagon, or rectangle.