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Geometry Dictionary

TermDefinition
Acute Angle An angle less than 90 degrees
Acute Triangle A triangle that has all angles less than 90 degrees
Adjacent Angles Two angles that have a common side and a common vertec and don't overlap
Angle Bisector A line that splits an angle into two equal angles
Angle The amount of trun between two lines around their common point (the vertex)
Collinear When three or more points slide on a straight line
Coplanar Points that are on the same plane
Equilateral (Equiangular) Triangle A triangle with all three sides of equal length
Isosceles Triangle A triangle with two equal sides
Line A long thin mark or boundary
Obtuse Angle An obtuse angle is more than 90 degrees but less than 180 degrees
Obtuse Triangle A triangle with an angle greater than 90 degrees A triangle can only have one obtuse angle
Plane A flat surface with no thickness and extends forever
Point An exact location It has no size only position
right Angle An angle which is equal to 90 degrees
Ray A part of a line with a start point but no end point
Segment The smallest part of a circle model when it is cut by a line or part of a line or curve
Scalene Triangle A triangle with all sides of different lengths
Skew Lines Lines that don't intersect and are not parallel
Straight Angle A straight angle changes the direction to point the opposite way. It looks like a straight line.
Vertical Angles The angles opposite each other when two lines cross. They are always equal.
Triangle A 3-sided flat shape with straight sides
Supplementary Angles Angles whose measures add up to 180 degrees
Complementary Angles Angles whose measures add up to 90 degrees
Median A segment drawn from a vertex to the midpoint of the side opposite
Altitude A segment drawn from a vertex perpendicular to the side opposite
Created by: user-1866784
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