Geometry Crossword

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Across
  1. 2. Angles that sum to 180 degrees
  2. 4. Angles that are on opposite sides of intersecting lines
  3. 5. A quadrilateral with two pairs of parallel sides
  4. 7. Angles that sum to 90 degrees
  5. 11. A three-sided closed figure
  6. 12. A quadrilateral with one pair of parallel sides
  7. 14. A transformation that flips a figure across a line
Down
  1. 1. A transformation that moves a figure without rotating or flipping it
  2. 3. A famous theorem: a² + b² = c²
  3. 6. A figure with exactly four sides and four right angles
  4. 8. Angles that share a common side
  5. 9. A four-sided figure with all sides equal and all angles right angles
  6. 10. A half-circle shape
  7. 13. A closed figure with straight sides
  8. 15. A type of figure where all points are equidistant from the center