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Howard Geometry 1
Chapter 1 Geometry Vocabulary
Term | Definition |
---|---|
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 |