Basic Geometry Vocab
Terms
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- Angle
- 2 rays joined at a common point.
- Reflex Angle
- Any angle between 180-360 degrees.
- Parallelogram
- A quadrilateral with opposite sides that are parallel and of equal length and opposite and opposite angles that are equal.
- Rectangle
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A quadrilateral with 4 right angles and 2 pairs of equal parallel lines.
- Acute Triangle
- A triangle whose angles are between 0 - 90 degrees.
- Square
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A quadilateral sides with 4 equal sides and 4 right angles. - Isoceles Triangle
- A triangle with 2 equal sides and 2 equal angles.
- Straight Angle
- An Angle measuring 180 degrees.
- Quadrilateral
- Polygon with 4 sides.
- Scalene Triangle
- A triangle in which all 3 sides are a different length.
- Obtuse Triangle
- A triangle with 1 angle being between 90-180 degrees.
- Right Triangle
- A triangle that has a right angle (90 degrees).
- Degree
- A unit of measure to measure angles.
- Right Angle
- An angle measuring 90 degrees.
- Protractor
- A tool to measure angles.
- Polygon
- A plane shape having 3 or more sides.
- Triangle
- A polygon with 3 sides and 3 angles.
- Parallel
- Lines that are the same distance apart.
- Congruent
- Figures that have the same size and shape.
- Perpendicular lines
- Lines that intersect at right angles.
- Compass
- A tool to make circles
- Obtuse Angle
- An angle measuring between 90-180 degrees.
- Line
- A long thin continuous mark that goes in both directions.
- Line Segment
- A section of a line bounded by 2 endpoints.
- Ray
- A line that has a starting point but no ending.
- Acute Angle
- An angle measuring less than 90 degrees.
- Point
- A position in space. A very small location.