Math is fun

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Across
  1. 1. +
  2. 2. outside distance
  3. 4. the calculate or to judge the value
  4. 6. to make certain that something is correct or true
  5. 7. =
  6. 10. ANGLE angle=90
  7. 11. to prove,to guide,or to explain
Down
  1. 1. 1 pair of parallel line
  2. 2. to show to be true
  3. 3. to have a good reason
  4. 5. to find a solution
  5. 8. a simple,rough drawing
  6. 9. __four different types of triangles