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Math Vocabulary

Chapter 19, Part 1

point an exact location in space
line segment a part of a line that includes two points called endpoints and all the points between them
endpoint the point at either end of a line segment or the starting point of a ray
line a straight path of points that continues without end in both directions with no endpoints
ray part of a line that has no endpoint and continues without end in one direction
plane a flat surface that continues without end in all directions
dimension a measurement along a straight line of length, width, or height of a figure
one-dimensional a measure in only one direction, such as length
two-dimensional a measure in two directions, such as length and width
angle a figure formed by two line segments or rays that share an endpoint
vertex the point at which two rays of an angle meet or two (or more) line segments meet in a plane figure, or where three or more edges meet in a solid figure; the top point of a cone
degree (°) the unit used for measuring angles and temperatures
protractor a tool for measuring the size of an angle
right angle an angle that forms a square corner and has a measure of 90 degrees
acute angle an angle that measures greater than 0 degrees and less than 90 degrees
straight angle an angle whose measure is 180 degrees
obtuse angle an angle that measures greater than 90 degrees and less than 180 degrees
Created by: RossCoops3