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Geometry Dictionary
6th grade geometry terms and image
| Question | Answer |
|---|---|
| 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 |