Mathematics Puzzle

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Across
  1. 1. A quick rough drawing that shows the main features of an object or scene
  2. 5. A rectangle with equal sides
  3. 8. To make something easier to do or understand
  4. 9. A parallelogram with right angles
  5. 10. A four-sided shape made up of two pairs of straight parallel lines that are equal in length
  6. 11. A quadrilateral which only one pair of opposite sides are parallel
  7. 12. To show the exstence,truth,or correctness of something by using evidence, logic,etc
Down
  1. 2. To form an opinion of the amount,value or quality of something after thinking about it carefully
  2. 3. An angle that more than 90 degrees but less than 180 degrees
  3. 4. A parallelogram with equal side length
  4. 6. To find a way to deal with and end a problem
  5. 7. To get a general idea about the value,size,or cost of something