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Unit 3 Geometry

Lines, Angles, and Reflections

TermDefinition
reflection a flip of a geometric figure
rotation a turn of a geometric figure
reflective symmetry the property of a figure that can be folded along a line so that the two halves match exactly
rotational symmetry the property of a figure that can be turned less than 360 degrees and be identical with itself.
acute angle an angle that has a measure less than 90 degrees
right angle an angle that has a 90 measure
obtuse angle an angle that has a measure more than 90 degrees and less than 180 degrees
perpendicular lines lines that intersect to form a right angle
line of symmetry a line that divides a figure into two mirror images
straight angle an angle whose measure is 180 degrees
parallel lines two or more lines that are always the same distance apart and never intersect no matter how far they are extended
zero angle an angle whose measure is zero degrees
degree a unit for measuring the size of angles
Created by: MrsLaFayette