Complete the following crossword

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Across
  1. 5. Polygon that has three sides
  2. 8. Shape that has 4 sides
  3. 10. Polygon that has seven sides
  4. 13. Lines that cross and form a ninety degree angle
  5. 14. Polygons have __________ sides
  6. 15. Triangle with two equal sides
  7. 16. Shape that has 2 pairs of parallel sides and 2 pairs of equal opposite angles
Down
  1. 1. Object used to measure and create angles
  2. 2. Triangle with three equal sides
  3. 3. Lines that never cross
  4. 4. Triangle with none equal sides
  5. 6. Angle that has a measure between 0 and 90 degrees
  6. 7. Angle that has a measure between 180 and 360 degrees
  7. 9. Polygon that has ten sides
  8. 11. Angle that has a measure between 90 and 180 degrees
  9. 12. Measure of a right angle