Geometry

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Across
  1. 2. an object, shape, or arrangement in the form of a pyramid.
  2. 4. a plane figure with four equal straight sides and four right angles.
  3. 5. a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).
  4. 6. a solid geometric figure with straight parallel sides and a circular or oval cross section.
  5. 9. a plane figure with at least three straight sides and angles, and typically five or more.
  6. 11. a plane figure with five straight sides and five angles.
  7. 14. a plane figure with three straight sides and three angles.
  8. 16. a four-sided plane rectilinear figure with opposite sides parallel.
  9. 17. a quadrilateral with only one pair of parallel sides.
  10. 19. a triangle in which one of the angles is an obtuse angle.
  11. 20. a plane figure with ten straight sides and angles.
Down
  1. 1. a round solid figure, or its surface, with every point on its surface equidistant from its center.
  2. 3. a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.
  3. 7. a plane figure with nine straight sides and nine angles.
  4. 8. a triangle with a right angle.
  5. 10. a plane figure with eight straight sides and eight angles.
  6. 12. a triangle with three acute angles, that means they measure less than 90°.
  7. 13. a plane figure with six straight sides and angles.
  8. 15. neither parallel nor at right angles to a specified or implied line; askew; crooked.
  9. 18. side by side and having the same distance continuously between them.