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Geometry Vocabulary

Geometry Vocabulary. A Third Grade Unit. centimeter. A metric unit used to measure length. 1 centimeter. Line Segment. A part of a line. A line segment has two endpoints. It starts and stops. Line. A straight path that goes on forever in both directions. Horizontal.

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Geometry Vocabulary

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  1. Geometry Vocabulary A Third Grade Unit

  2. centimeter A metric unit used to measure length. 1 centimeter

  3. Line Segment A part of a line. A line segment has two endpoints. It starts and stops.

  4. Line A straight path that goes on forever in both directions

  5. Horizontal A line that extends from left to right.

  6. vertical A line that extends up and down.

  7. Parallel lines Lines that never intersect or cross.

  8. Perpendicular lines Two lines that cross or meet to form right angles or square corners.

  9. perimeter The distance around the outside of a figure. To find perimeter all of the sides in the shape are added together. side + side + side = perimeter 4 cm 4 cm 3 cm 4 cm + 4 cm + 3 cm = 11 cm

  10. quadrilateral A figure with four sides.

  11. Adjacent sides Two sides that meet at a point. They are next to each other. They are NOT opposite each other. a d b c Sides a and d are adjacent to each other. Sides a and c are opposite each other.

  12. parallelogram A quadrilateral with both pairs of opposite sides parallel. Only one set of opposite lines are parallel.

  13. Rectangle A parallelogram that has 4 right angles. Opposite sides are the same length. 4 cm 2 cm 2 cm 4 cm

  14. square A special rectangle with four sides of the same length and four right angles. 3 cm 3 cm 3 cm 3 cm

  15. rhombus A parallelogram with equal sides. A rhombus does not have to have right angles but it can. 2 cm 2 cm 3 cm 3 cm 3 cm 2 cm 2 cm 3 cm 4 cm 4 cm 4 cm 4 cm

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