right angles
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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."
What is a 'Straight Angle'???? Perpendicular lines meet at 90 degrees ( right- angles).
They are perpendicular lines
Perpendicular lines intersect to form right angles
Perpendicular lines form right angles at their intersections.