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# Howard Geometry 1

### Chapter 1 Geometry Vocabulary

TermDefinition
vertex point where two angle's sides meet
plane a two dimension that extends in four directions; it can be defined with three non-collinear points
transformation the operation, or set of instructions, that maps a figure onto an image
collinear points points on the same line
angle two rays that share the same endpoint
ray a part of a line that has a beginning but no end
acute angle an angle that has a measure between 0 and 90 degrees
endpoint the point where a ray begins
intersection the point or points that two figures have in common
translation a slide that preserves both size and shape
coplanar points points on the same plane
undefined terms mathematical terms that cannot be defined mathematically defined using other known words
obtuse angle an angle that has a measure between 90 and 180 degrees
rotation a transformation in which a figure is turned about a fixed point
line a figure named by two points that extends forever in 2 directions
congruent segments segments that have exactly the same length
image the new figure after the transformation has taken place
reflection a transformation in which a figure is flipped about a given line or axis
coordinate the x or y component of a point
degrees the units that a protractor measures an angle
segment a part of a line that has both a beginning and an end
coplanar lines lines that are on the same plane
right angle an angle whose measure is exactly 90 degrees
straight angle an angle whose measure is exactly 180 degrees
Created by: Brit Howard