Lines and Angles
Parallel lines – Coplanar lines that do not intersect. Symbol: || G F
Parallel lines – Coplanar lines that do not intersect. Symbol: || E A D H B C G F
Parallel lines – Coplanar lines that do not intersect. Symbol: || E A D H B C G F
Skew lines – Lines that do not intersect and are not parallel because they are noncoplanar. G F
Skew lines – Lines that do not intersect and are not parallel because they are noncoplanar. G F
Skew lines – Lines that do not intersect and are not parallel because they are noncoplanar. G F
Parallel Planes – Planes that do not intersect. B C G F
Parallel Planes – Planes that do not intersect. B C G F
Transversal – A line that intersects two or more coplanar lines at distinct points. 1 2 3 4 5 6 7 8 l m t transversal
Angles 3, 4, 5, and 6 lie between lines l and m Angles 3, 4, 5, and 6 lie between lines l and m. They are interior angles. transversal
Angles 1, 2, 7, and 8 lie outside lines l and m Angles 1, 2, 7, and 8 lie outside lines l and m. They are exterior angles. transversal
Alternate Interior Angles interior, nonadjacent, opposite sides of transversal 1 2 3 4 5 6 7 8 l m t 4 and 6 3 and 5
Alternate Exterior Angles exterior, nonadjacent, opposite sides of transversal 1 2 3 4 5 6 7 8 l m t 1 and 7 2 and 8
Corresponding Angles 1 and 5 2 and 6 4 and 8 3 and 7 same side of transversal, corresponding positions at each vertex 1 2 3 4 5 6 7 8 l m t 1 and 5 2 and 6 4 and 8 3 and 7
Same Side Interior Angles (Consecutive Interior Angles) interior, same side of transversal 1 2 3 4 5 6 7 8 l m t 4 and 5 3 and 6