Enrichment Crossword Puzzle

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Across
  1. 1. The opposite of Multiplication
  2. 3. An angle that is greater than 90 degrees
  3. 6. The name of any 4 sided shape
  4. 9. A shape with only 3 sides and 3 vertices
  5. 11. The operation you do when finding the area of a rectangle.
  6. 12. Word used when measuring how tall a shape is
  7. 13. When finding the inside of a shape, you are finding this
Down
  1. 2. A shape with 4 equal sides and 4 right angles
  2. 4. Type of lines that will never meet
  3. 5. The length of a shape can also be called this
  4. 7. The operation you do when finding the sum of 2 or more numbers
  5. 8. What the outside of a shape is called
  6. 10. An angle that is exactly 90 degrees
  7. 14. An angle that is smaller than 90 degrees