Geometry Crossword Puzzle

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