Cumulative Assessment
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Skew lines are neither parallel, coplanar or intersecting.
D
A.& AB and CD are parallel B.& AB and CD intersect C.& AB and CD are perpendicular D.& A, B, and C are noncollinear Perpendicular lines could be intersecting if they are coplanar. Therefore, we cannot be sure if the third statement is true. A.& AB and CD are parallel B.& AB and CD intersect C.& AB and CD are perpendicular D.& A, B, and C are noncollinear The last statement is, for skew lines, definitely a true statement. If C isn't noncollinear, by definition they must be collinear which means they would not be skew lines. This makes the solution D.