alternative Exterior Angles

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

alternative Interior Angles

Angles created when a transversal intersects with two lines. Alternating interior angle lie on opposite political parties of the transversal, and on the inner of the space between the two lines. The is, castle lie in between the two lines that intersect v the transversal.

You are watching: The common endpoint of two segments or rays that form the "corner" of an angle


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

angle Bisector

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

edge Trisector

A ray, among a pair, the shares a typical vertex v an angle, lies within the interior of the angle, and also creates, with its partner, three brand-new angles of same measure. Edge trisectors come in pairs.

safety 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 have the right to be congruent to other angles andsegments have the right to be congruent come othersegments.

equivalent Angles

A pair of angles created when a transversal intersects through two lines. Each angle in the pair is on the exact same side the the transversal, yet one is in the exterior that the space created in between the lines, and also one lies top top the interior, between the lines.


A unit of measure up for the dimension of an angle. One full rotation is equal to 360 degrees. A ideal 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, one exterior angle is covered by the higher rotation of the two possible rotations. The measure of an exterior angle is constantly greater 보다 180 degrees and is constantly 360 degrees minus the measure up of the inner angle that accompanies it. Together, one interior and also exterior angle span the entire plane.

internal Angle

The smaller part of one angle, spanned by the space between the light ray that form an angle. Its measure up is always less 보다 180 degrees, and also is equal to 360 levels minus the measure up of the exterior angle.


The allude on a segment that lies exactly halfway indigenous each end of the segment. The street from the endpoint of a segment come its midpoint is fifty percent the length 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 provided a suggest not situated on a line, precisely one heat passes with the suggest that is parallel to original line.

Figure %: The parallel postulate


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

Perpendicular Bisector

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


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



A section of a line v a fixedendpoint ~ above one end that extends there is no bound in the other direction.

right Angle

A 90 level angle. The is the angle formed when perpendicular currently or segments intersect.

Segment Bisector

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

directly Angle

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

Supplementary Angles

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


A line that intersects through two other lines.


The common endpoint of 2 rays atwhich an edge is formed.

upright Angles

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

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Zero Angle

A zero degree angle. That is developed by two rays that share a peak and suggest in the same direction.