They can but don't have to as long as they are intersecting it doesn't matter whatt type of angles they form.
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NO!
The fact that they are perpendicular means that they intersect at right angles. Not an acute angle, not an obtuse angle but a right angle. That is what perpendicular is.
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intersecting lines * * * * * Non-perpendicular intersecting lines. Or else the angles would be right angles.
false
Perpendicular lines intersect to form right angles
The contrapositive to the statement, "if two lines intersect to form right angles, then they are perpendicular," is "if two lines are not perpendicular, then they do not form right angles."
They are perpendicular lines