Perpendicular
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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.
intersecting lines * * * * * Non-perpendicular intersecting lines. Or else the angles would be right angles.
perpendicular lines are a special type of intersecting line that happen to intersect at 90 degree angles
Actually there are 4 angles formed by 2 intersecting lines, and as long as the lines are PERPENDICULAR, the angles are all right angles, 90 degree each.
vertical angles