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| from two latin words meaning to mutually cut, intersecting lines cross each other. Formally in our geometry two lines intersect if and only if they have a point in common |
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| from two latin words meaning to run together concurrent lines cross each otherin a single point. technically even two interesecting lines are concurrent but generally in geometry this term refers to three or more lines. formally in our geometry three or more lines are ocncurrent if and only if they are coplanar and interesect in a single point |
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| from the gree meaning beside one another parallel lines remain beside one another and never intersect. formally in our geometry two lines are parallel if and only if they are coplanar and do not interesect |
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Term
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| from an old French work meaning ot escape skew lines are not coplanar. in other words each line escapes from teh plane containing the other line. formally in our geometry two lines are skew if and only if they are non coplanar which means of course that neither can they interesect |
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| from the latin meaning to hang as a plumb line perpendicular lines are lines whihc cna be though of as hanging at right angles from each other. formally in our geometry two lines are perpendicular ifa nd only if they interesect to form a right angle. |
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