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There are 12 edges in a cube.
4
No. Perpendicular lines for right angles. That is why they are called perpendicular.
If the lines are perpendicular, their slopes are negative reciprocals.If the lines are perpendicular, their slopes are negative reciprocals.If the lines are perpendicular, their slopes are negative reciprocals.If the lines are perpendicular, their slopes are negative reciprocals.