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**Basic Definitions in Geometry**

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Acute Angle An angle that measures between 0 and 90 degrees.

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Right Angle Angle that measures 90 degrees and formed by perpendicular lines.

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Obtuse Angle An angle that measures between 90 and 180 degrees.

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Straight Angle An angle that measures 180 degrees.

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Reflex Angle An angle that measures between 180 and 360 degrees.

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Complementary Angle Two angles that add up to 90 degrees.

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Supplementary Angles Two angles that add up to 180 degrees.

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Equilateral Triangle A triangle that has 3 equal sides.

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Equiangular Triangle A triangle that has 3 equal angles and each measures 60 degrees (sum is 180).

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Scalene Triangle Triangle with different sides and angles.

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Isosceles Triangle A triangle that has two equal sides and two equal base angles.

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Vertical Angles Two angles in which the sides of one angle are opposite rays to the sides of the second angle.

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Adjacent Angles Two angles having a common vertex and a common side, but do not have any interior points in common.

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Line Segment 2 points called endpoints and all of the points in between them.

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Ray A part of a line that consists of a point on the line, called the endpoint, and all of the points on one side of the line.

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Opposite Rays Two rays of the same line with a common endpoint and no other points in common.

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Collinear A set of points all lying on the same straight line.

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Midpoint The point of a line segment that divides it into 2 congruent (equal) parts.

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Bisector A line, ray, or segment which divides a segment into 2 congruent parts.

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Perpendicular Lines Two lines that intersect to form right angles.

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Altitude The perpendicular segment from a vertex of a polygon to the opposite side.

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Median A segment that joins any vertex of a triangle to the midpoint of the opposite side.

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