### alternating Exterior Angles

Angles developed when a transversal intersects v twolines. Alternating exterior angleslie top top opposite political parties of the transversal, and on the exterior ofthe space between the two lines.

### alternating Interior Angles

Angles created when a transversal intersects through two lines. Alternating interior angle lie on opposite sides of the transversal, and on the interior of the an are between the 2 lines. That is, lock lie in between the two lines the intersect through the transversal.

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### Angle

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

### edge Bisector

A ray that share a typical vertex with an angle, lies within the internal of that angle, and creates two new angles of equal measure.

### angle Trisector

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

### security Angles

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

### Congruent

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

### equivalent Angles

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

### Degree

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

radians.### Exterior Angle

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

### inner Angle

The smaller part of an angle, extended by the an are between the beam that kind an angle. Its measure is constantly less 보다 180 degrees, and also is same to 360 levels minus the measure up of the exterior angle.

### Midpoint

The allude on a segment that lies exactly halfway from each end of the segment. The street from the endpoint of a segment to its midpoint is fifty percent the size of the whole segment.

### Oblique

Not perpendicular.

### Obtuse Angle

An angle whose measure up is higher than 90 degrees.

### Parallel Lines

Lines that never intersect.

### Parallel Postulate

A postulate which says that provided a point not located on a line, specifically one line passes through the point that is parallel to original line.

Figure %: The parallel postulate### Perpendicular

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

### Perpendicular Bisector

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

### Radian

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

degrees.### Ray

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

### appropriate Angle

A 90 level angle. That is the angle created when perpendicular present or segments intersect.

### Segment Bisector

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

### straight Angle

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

### Supplementary Angles

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

### Transversal

A line that intersects v two various other lines.

### Vertex

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

### vertical Angles

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

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### Zero Angle

A zero level angle. That is developed by two rays that share a crest and point in the exact same direction.