Geometry Crossword Puzzle

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Across
  1. 1. An angle greater than 90 degrees but less than 180 degrees
  2. 6. A quadrilateral with both pairs of opposite sides parallel to each other
  3. 10. The sum of two angles equals 90 degrees
  4. 11. A parallelogram that has four right angles
  5. 12. A triangle with three unequal sides and angles
Down
  1. 2. The sum of two angles equals 180 degrees
  2. 3. A triangle with all sides and angles equal
  3. 4. Any polygon with four sides
  4. 5. A straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
  5. 7. An angle less than 90 degrees but greater than 0 degrees
  6. 8. A triangle that has two equal sides
  7. 9. A straight line extending from the center of a circle to the circumference or surface