Geometry Crossword

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Across
  1. 3. two angles that add up to 180 degrees are said to be this
  2. 6. a diagram with fact bubbles and a conclusion bubble with justifications to prove some fact
  3. 7. a polygon with 4 sides
  4. 11. a quadrilateral with exactly 1 pair of parallel sides
  5. 12. a quadrilateral with four right angles
  6. 13. a rigid transformation that involves flipping a figure over a line of reflection
  7. 16. adjacent/hypotenuse
  8. 18. a line segment that has both endpoints on a circle
  9. 19. opposite/adjacent
Down
  1. 1. a quadrilateral with 2 pairs of adjacent equal sides
  2. 2. a line that goes from one corner to another in a polygon
  3. 3. a quadrilateral with four right angles and four equal side lengths
  4. 4. the distance around a 2D shape's exterior
  5. 5. a rigid transformation that involves sliding a figure to a new location
  6. 8. the number of square units needed to fill up a region on a flat surface
  7. 9. opposite/hypotenuse
  8. 10. two lines that meet at a right angle
  9. 14. a line that intersects a circle at one point
  10. 15. a point that divides a line into two equal parts
  11. 17. the set of points equidistant from a central point