Geometry Crossword Puzzle

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