alternative Exterior Angles

Angles developed when a transversal intersects with twolines. Alternate exterior angleslie ~ above opposite sides of the transversal, and on the exterior ofthe an are between the 2 lines.

alternating Interior Angles

Angles developed when a transversal intersects with two lines. Alternating interior angles lie ~ above opposite political parties of the transversal, and also on the interior of the space between the 2 lines. The is, lock lie between the 2 lines the intersect v the transversal.

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A geometric number consisting that the union of 2 rays the share a usual endpoint.

angle Bisector

A ray that share a common vertex through an angle, lies in ~ the internal of the angle, and also creates two new angles of equal measure.

angle Trisector

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

security Angles

A pair of angles whose steps sum come 90 degrees. Each angle in the pair is the other"s complement.


Of the very same size. Angles have the right to be congruent to various other angles andsegments deserve to be congruent come othersegments.

equivalent Angles

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


A unit of measure for the size of one angle. One full rotation is same to 360 degrees. A right angle is 90 degrees. One degree equals


Exterior Angle

The larger component of one angle. Were among the rays of an edge to be rotated till it met the other ray, an exterior edge is extended by the better rotation of the two possible rotations. The measure of an exterior edge is constantly greater 보다 180 degrees and also is constantly 360 levels minus the measure of the inner angle the accompanies it. Together, an interior and also exterior angle expectations the entire plane.

interior Angle

The smaller part of an angle, covered by the space between the rays that type an angle. Its measure up is constantly less than 180 degrees, and also is equal to 360 degrees minus the measure of the exterior angle.


The point on a segment that lies specifically halfway native each end of the segment. The distance from the endpoint of a segment come its midpoint is half the size of the entirety segment.


Not perpendicular.

Obtuse Angle

An edge whose measure is higher than 90 degrees.

Parallel Lines

Lines that never intersect.

Parallel Postulate

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

Figure %: The parallel postulate


At a 90 degree angle. A geometric figure (line, segment, plane, etc.) is constantly perpendicular to an additional figure.

Perpendicular Bisector

A heat or segment that is perpendicular come a segment and contains the midpoint of that segment.


A unit for measuring the size of an angle. One full rotation is same to 2Π radians. One radian is same to



A portion of a line with a fixedendpoint on one end that extends without bound in the various other direction.

appropriate Angle

A 90 degree angle. That is the angle created when perpendicular currently or segments intersect.

Segment Bisector

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

straight Angle

A 180 degree angle. Developed by tworays that share a typical vertex and suggest in opposite directions.

Supplementary Angles

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


A line that intersects v two various other lines.


The usual endpoint of two rays atwhich an edge is formed.

upright Angles

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

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Zero Angle

A zero level angle. It is created by 2 rays the share a crest and suggest in the same direction.