alternative Exterior Angles

Angles produced when a transversal intersects v twolines. Alternative exterior angleslie ~ above opposite sides of the transversal, and on the exterior ofthe room between the 2 lines.

alternating Interior Angles

Angles created when a transversal intersects with two lines. Alternate interior angles lie ~ above opposite political parties of the transversal, and on the interior of the room between the 2 lines. The is, they lie in between the 2 lines that intersect with the transversal.

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

angle Bisector

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

angle Trisector

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

security Angles

A pair of angle whose actions 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 have the right to be congruent come othersegments.

equivalent Angles

A pair that angles produced when a transversal intersects v two lines. Each angle in the pair is top top the exact same side that the transversal, but one is in the exterior that the an are created in between the lines, and also one lies ~ above the interior, in between the lines.


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


Exterior Angle

The larger component of one angle. Were one of the rays of an angle to be rotated until it met the other ray, an exterior angle is spanned by the higher rotation of the two possible rotations. The measure up of an exterior edge is constantly greater than 180 degrees and also is always 360 levels minus the measure of the internal angle the accompanies it. Together, one interior and also exterior angle expectations the whole plane.

interior Angle

The smaller component of an angle, spanned by the room between the beam that form an angle. Its measure up is constantly less than 180 degrees, and is equal to 360 levels minus the measure of the exterior angle.


The suggest on a segment that lies precisely halfway indigenous each finish of the segment. The street from the endpoint of a segment to its midpoint is fifty percent the length of the whole segment.


Not perpendicular.

Obtuse Angle

An edge whose measure is greater than 90 degrees.

Parallel Lines

Lines that never intersect.

Parallel Postulate

A postulate which claims that given a allude not situated on a line, exactly one line passes with the allude that is parallel to original line.

Figure %: The parallel postulate


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

Perpendicular Bisector

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


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



A part of a line through a fixedendpoint top top one finish that extends there is no bound in the various other direction.

ideal Angle

A 90 degree angle. That is the angle formed when perpendicular present or segment intersect.

Segment Bisector

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

directly Angle

A 180 degree angle. Created by tworays that share a common vertex and suggest 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 that intersects v two other lines.


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

upright Angles

Pairs of angles developed where two lines intersect. These angles are formed by light ray pointing in the opposite directions, and also they are congruent. Vertical angle come in pairs.

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Zero Angle

A zero level angle. That is formed by 2 rays the share a peak and allude in the very same direction.