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# Geometry Unit

### Terrell-GEOMETRY: Terms from the Intro to Geometry Unit (May)

TermDefinitionExample
POINT A location in space. (picture needed)
LINE A series of points that continues in two directions and never ends. (picture needed)
RAY A part of a line that has one endpoint and continues in one direction without ending. (picture needed)
LINE SEGMENT A part of a line that has two definite endpoints. (picture needed)
PLANE A flat surface that continues in all directions without end. (picture needed) or real-life examples: sheet of paper, floor, ceiling, wall, etc.
COLLINEAR The condition where two or more points lie in a line. (picture needed)
PARALLEL The condition where two or more figures lie alongside each other and never intersect. (picture needed)
ANGLE A figure formed by two rays or line segments that begin at the same point. (picture needed)
VERTEX The common endpoint of two or more rays or line segments. (picture needed)
ACUTE ANGLE An angle whose measure is between 0 and 90 degrees. (picture needed) or list an angle and its measure: angle ABC is 30 degrees, therefore it is an acute angle
RIGHT ANGLE An angle whose measure is exactly 90 degrees. (picture needed) or list an angle and its measure: angle ABC is 90 degrees, therefore it is a right angle
OBTUSE ANGLE An angle whose measure is between 90 and 180 degrees. (picture needed) or list an angle and its measure: angle ABC is 137 degrees, therefore it is a obtuse angle
STRAIGHT ANGLE An angle whose measure is exactly 180 degrees. (picture needed) or list an angle and its measure: angle ABC is 180 degrees, therefore it is a straight angle
PERPENDICULAR The condition where two figures intersect at a right angle. (picture needed) or list an example: line AB is perpendicular to line CD, because they intersect at a right angle
CONGRUENT Having the same length or measure. (picture needed) or list an example: segments AB and CD are congruent, because AB = 5 inches and CD = 5 inches
Created by: terrellmath