alternate Exterior Angles

Angles created when a transversal intersects with twolines. Alternative exterior angleslie top top opposite political parties of the transversal, and also on the exterior ofthe room between the 2 lines.

alternative Interior Angles

Angles created when a transversal intersects v two lines. Alternate interior angles lie on opposite political parties of the transversal, and also on the inner of the room between the two lines. That is, lock lie in between the two lines that intersect with the transversal.

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

edge Bisector

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

angle Trisector

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

safety Angles

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


Of the same size. Angles deserve to be congruent to various other angles andsegments deserve to be congruent to othersegments.

matching Angles

A pair of angles created when a transversal intersects through two lines. Every angle in the pair is on the very same side of the transversal, however one is in the exterior the the room created between the lines, and also one lies ~ above the interior, between the lines.


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


Exterior Angle

The larger part of an angle. Were among the beam of an angle to it is in rotated until it met the other ray, one exterior edge is spanned by the higher rotation of the two possible rotations. The measure up of an exterior angle is constantly greater 보다 180 degrees and is always 360 degrees minus the measure up of the inner angle that accompanies it. Together, an interior and exterior angle expectancy the whole plane.

inner Angle

The smaller part of one angle, spanned by the space between the beam that form an angle. Its measure is constantly less than 180 degrees, and also is same to 360 levels minus the measure up of the exterior angle.


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


Not perpendicular.

Obtuse Angle

An angle whose measure is higher than 90 degrees.

Parallel Lines

Lines that never intersect.

Parallel Postulate

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

Figure %: The parallel postulate


At a 90 level angle. A geometric number (line, segment, plane, etc.) is always perpendicular to another figure.

Perpendicular Bisector

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


A unit because that measuring the size of one angle. One complete rotation is same to 2Π radians. One radian is equal to



A section of a line with a fixedendpoint ~ above one end that extends without bound in the various other direction.

ideal Angle

A 90 level angle. It is the angle formed when perpendicular present or segment intersect.

Segment Bisector

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

directly Angle

A 180 level angle. Developed by tworays the share a common vertex and suggest in the contrary directions.

Supplementary Angles

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


A line that intersects through two various other lines.


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

vertical Angles

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

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Zero Angle

A zero level angle. The is created by two rays that share a crest and suggest in the very same direction.