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Geometry Dictionary

6th grade geometry terms and image

A figure formed by two rays or line segments with a common endpoint. The rays or line segmanets are called "sides." Angle
The common endpoint in an angle Vertex
Has a measure greater than 0 and less than 90 Acute Angle
Has a measure of 90 Right Angle
Has a measure of 180 Straight Angle
Has a measure greater than 180 but less than 360 Reflex Angle
Has a measure greater than 90 but less than 180 obtuse Angle
Two angles whose measures total 90 Complementary Angles
Opposite angles that are equal in measure. When two lines intersect, the angles that do not share a common side Vertical Angles
A line that crosses two or more lines. Transversal
Two angles whose measures total 180 Supplementary Angles
Angles that are next to each other. Adjacent angles have a common vertex and share a common side. Adjacent Angles
Having the dame size and shape Congruent
Having the same relative position in similar or congruent figures Corresponding Angles or Sides
The angles of a 2 dimensional or 3 dimensional figure Interior Angles
The outside angles of a 2 dimensional or 3 dimensional figure Exterior Angles
Something done to a figure that produces a new figure (translation, reflection, or rotation) Transformation
The ORIGINAL geometric figure that is changes (by a reflection, rotation, or translation) to produce another figure. Pre-Image
A NEW figure that is produced by a transformation of another image Image
"Turning" a figure around a fixed point Rotation
The "flipping" of a figure over a line. Reflection
"Sliding" a figure a certain distance Translation
Two lines that never meet, no matter how far they are extended Parallel Lines
Two Lines that cross or meet at a right angle Perpendicular Lines
A line that divides a segment, angle, or figure into two equal parts. Bisector
A point halfway between two points Midpoint
Created by: stephanielynnej