Geometry crossword

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Across
  1. 4. A shape which has 6 sides.
  2. 5. A shape which has 8 sides.
  3. 7. An angle less than 180 but more than 90 degrees.
  4. 12. The space between two intersecting lines.
  5. 14. An angle less than 90 but more than 0 degrees.
  6. 16. A parallelogram with all equal sides.
  7. 17. A shape which has 5 sides.
  8. 18. An angle formed on the outer side of two parallel lines when a third line intersects the 2 lines.
  9. 20. A round figure with no sides and an equidistant center.
Down
  1. 1. An angle which exactly measures 90 degrees.
  2. 2. A polygon with 4 sides.
  3. 3. A triangle with an angle that is equal to 90 degrees.
  4. 6. A shape with parallel and equal opposite sides.
  5. 8. parallelogram with a right angle.
  6. 9. branch of mathematics that deals with points, lines, planes and solids and examines their
  7. 10. A parallelogram having 4 right angles.
  8. 11. A shape with all equal sides and angles.
  9. 13. A shape which has 7 sides.
  10. 15. a prism where all sides are squares.
  11. 19. A line from the equidistant center of the circle to the surface.