# Lines and Angles Geometry PARALLEL LINES Two lines

- Slides: 16

Lines and Angles Geometry

PARALLEL LINES Two lines are parallel lines if they are coplanar and do not intersect.

Notation for Parallel • Know how to label it in a picture • Know how to write that 2 lines are parallel

SKEW LINES Lines that do not intersect and are not coplanar are called skew lines.

PARALLEL PLANES Two planes that do not intersect are called parallel planes.

PARALLEL POSTULATE If there is a line and a point not on the line, then there is exactly one line through the point parallel to the given line.

PERPENDICULAR POSTULATE If there is a line and a point not on the line, then there is exactly one line through the point perpendicular to the given line.

TRANSVERSAL A transversal is a line that intersects two or more coplanar lines at different points.

INTERIOR ANGLES Four interior angles lie in the region between the two lines.

EXTERIOR ANGLES Four exterior angles lie in the two regions that are not between the two lines.

CORRESPONDING ANGLES Two angles are corresponding angles if they occupy similar positions. They will be on the same side of the transversal and on the same side of the two lines.

ALTERNATE EXTERIOR ANGLES Two angles are alternate exterior angles if they lie outside the two lines on opposite sides of the transversal.

ALTERNATE INTERIOR ANGLES Two angles are alternate interior angles if they lie between the two lines on opposite sides of the transversal.

CONSECUTIVE INTERIOR ANGLES Two angles are consecutive interior angles if they lie between the two lines on the same side of the transversal.

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