3.1.1 Planes, Lines, and Angles Flashcards
Parallel lines (||)
they are coplanar and do not intersect
Perpendicular lines (⊥)
they intersect at 90° angles.
Skew lines
they are not coplanar. Skew lines are not parallel and do not intersect.
Parallel planes
they are planes that do not intersect.
A transversal
a line that intersects two coplanar lines at two different points.
Corresponding angles
they lie on the same side of the transversal and on the same side of the other two lines.
Alternate interior angles
they are nonadjacent angles that lie on opposite sides of the transversal and between the other two
lines.
Alternate exterior angles
they lie on opposite sides of the transversal and outside the other two lines.
Same-side interior angles
they lie on the same side of the transversal and between the other two lines.
