Zoe's Geometry Puzzle

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Across
  1. 3. the branch of mathematics that has to do with shapes and spacial relationships
  2. 4. an angle less than 90 degrees
  3. 5. Adjacent angles that together form a straight angle are a _________ pair.
  4. 9. the branch of mathematics that deals with calculations that include symbols for unknown values
  5. 11. equal angles
  6. 13. a polygon with six sides
  7. 14. The sides of a polygon that share a vertex are said to be _________.
  8. 16. Angles that together add up to 180 degrees are called _________ angles.
  9. 17. the point where two lines, line segments, or rays meet to form an angle
  10. 18. Equivalent angles formed by the crossing of two lines, line segments, or rays are called _________ angles.
  11. 19. A triangle with one obtuse angle is an __________ triangle.
  12. 20. equal sides
Down
  1. 1. the units used to measure angles
  2. 2. Angles that together add up to 90 degrees are called _________ angles.
  3. 6. a polygon with five sides
  4. 7. literally meaning "four sides"
  5. 8. a closed shape with straight sides that don't cross
  6. 10. A 90-degree angle is called a _________ angle.
  7. 12. an angle that is greater than 180 degrees but less than 360
  8. 15. a triangle that has two or more equal sides