Introduction to Geometry

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Across
  1. 2. A 3D figure with polygonal base and triangular lateral faces that meet at a single point called apex.
  2. 3. polygon. A polygon with all sides being equal.
  3. 6. polygon. A polygon with at least one of the interior angles being greater than 180°.
  4. 10. angle. An angle in 90°.
  5. 11. angle. An angle greater than 0° and less than 90°.
  6. 12. A perfectly round 3D figure where every point on its surface is equidistant from a single, central point. It looks like a ball.
  7. 17. polygon. A polygon with all sides and all interior angles being equal.
  8. 20. angle. An angle in 180°.
  9. 21. A 3D figure defined by two identical and parallel circular bases connected by a continuous curved lateral surface.
  10. 22. triangle. A triangle with one angle in 90°.
  11. 24. triangle. A triangle with all sides being unequal.
  12. 25. angle. An angle in 360°.
Down
  1. 1. angles. Two angles whose measures add up to 180°.
  2. 4. angle. An angle greater than 90° and less than 180°.
  3. 5. angles. Two angles whose measures add up to 90°.
  4. 7. triangle. A triangle with one angle greater than 90° and less than 180°.
  5. 8. A 3D figure with a curved surface that narrows smoothly from flat, circular base to a point called vertex or apex.
  6. 9. triangle. A triangle with all sides being equal.
  7. 13. lines. Two straight lines on the same plane do not intersect no matter how far they extend.
  8. 14. polygon. A polygon with all interior angles being equal.
  9. 15. lines. Two straight lines intersect and form a right angle.
  10. 16. triangle. A triangle with all angles being greater than 0° and less than 90°.
  11. 18. triangle. A triangle with two sides being equal.
  12. 19. polygon. A polygon with all interior angles being less than 180°.
  13. 22. angle. An angle greater than 180° and less than 360°.
  14. 23. A 3D figure with two ends in the same shape.