alternating Exterior Angles

Angles created when a transversal intersects through twolines. Alternate exterior angleslie on opposite sides of the transversal, and on the exterior ofthe space between the two lines.

alternating Interior Angles

Angles developed when a transversal intersects through two lines. Alternate interior angle lie ~ above opposite sides of the transversal, and on the internal of the space between the 2 lines. The is, castle lie between the two lines the intersect v the transversal.

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A geometric number consisting of the union of two rays that share a typical endpoint.

edge Bisector

A ray that shares a usual vertex with an angle, lies in ~ the inner of the angle, and creates two new angles of same measure.

angle Trisector

A ray, among a pair, the shares a usual vertex through an angle, lies in ~ the internal of the angle, and also creates, through its partner, three brand-new angles of same measure. Angle trisectors come in pairs.

safety Angles

A pair of angle whose measures sum come 90 degrees. Every angle in the pair is the other"s complement.


Of the exact same size. Angles can be congruent to other angles andsegments can be congruent to othersegments.

matching Angles

A pair the angles created when a transversal intersects with two lines. Each angle in the pair is top top the very same side of the transversal, yet one is in the exterior of the an are created between the lines, and one lies ~ above the interior, in between the lines.


A unit of measure up for the size of one angle. One complete rotation is equal to 360 degrees. A appropriate angle is 90 degrees. One level equals


Exterior Angle

The larger part of one angle. Were one of the light ray of an angle to it is in rotated till it met the various other ray, an exterior edge is spanned by the better rotation the the two feasible rotations. The measure up of one exterior angle is always greater than 180 degrees and also is constantly 360 degrees minus the measure of the internal angle that accompanies it. Together, an interior and also exterior angle span the entire plane.

inner Angle

The smaller component of one angle, extended by the room between the rays that type an angle. Its measure is constantly less 보다 180 degrees, and is equal to 360 degrees minus the measure of the exterior angle.


The suggest on a segment the lies precisely halfway indigenous each end of the segment. The distance from the endpoint that a segment come its midpoint is half the length of the whole segment.


Not perpendicular.

Obtuse Angle

An angle whose measure is greater than 90 degrees.

Parallel Lines

Lines that never ever intersect.

Parallel Postulate

A postulate which says that given a point not situated on a line, precisely one heat passes through the point that is parallel to initial line.

Figure %: The parallel postulate


At a 90 degree angle. A geometric figure (line, segment, plane, etc.) is always perpendicular to one more figure.

Perpendicular Bisector

A line or segment that is perpendicular to a segment and contains the midpoint of the segment.


A unit because that measuring the size of an angle. One full rotation is equal to 2Π radians. One radian is equal to



A portion of a line through a fixedendpoint on one finish that extends without bound in the other direction.

ideal Angle

A 90 level angle. That is the angle developed when perpendicular lines or segments intersect.

Segment Bisector

A line or segment that consists of the midpoint the a segment.

right Angle

A 180 level angle. Developed by tworays that share a typical vertex and allude in the contrary directions.

Supplementary Angles

A pair of angle whose steps sum to 180 degrees. Each angle in the pair is the other"s supplement.


A line the intersects with two various other lines.


The usual endpoint of 2 rays atwhich an angle is formed.

vertical Angles

Pairs that angles created where 2 lines intersect. These angles are developed by beam pointing in the contrary directions, and they room congruent. Vertical angles come in pairs.

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Zero Angle

A zero degree angle. The is created by 2 rays that share a peak and point in the exact same direction.