Relation 指令

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Relation[ <Object>, <Object> ]

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Relation[Object a, Object b]

Shows a message box that gives you information about the relation between object a and object b.

This command allows you to find out whether

• two lines are perpendicular
• two lines are parallel
• two objects are equal
• a point lies on a line or conic
• a line is tangent or a passing line to a conic.

备注： See also Relation tool.