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Two lines are said to be perpendicular when they are at right angles. That means that the angle between them is 90 degrees.There are other meanings of perpendicular; for example, a line is said to be perpendicular to a plane when it is perpendicular to EVERY line of the plane that goes through the intersection.

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at an angle of 90° to a given line, plane, or surface

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8y ago
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Q: What dos perpendicular mean?
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