Dezyre's geometry

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Across
  1. 3. the number of square units needed to cover a surface
  2. 5. the middle number in a set of data that are arranged in order
  3. 6. a closed plane figure formed by 3 or more line segments
  4. 9. in a right triangle, either of two sides that form the right angle
  5. 10. a line segment with endpoints on a circle
  6. 12. the product of a given whole number and another whole number
  7. 15. to find a number that is close to an exact amount
  8. 16. the distance around a closed plane figure
  9. 17. the distance around a circle
  10. 19. the horizontal number line on a coordinate plane
Down
  1. 1. a letter or symbol that stands for 1 or more numbers
  2. 2. the average of a set of numbers, found by dividing the sum of the set by the number of addends
  3. 4. a parallelogram with congruent sides
  4. 7. a diagram that shows the prime factors of a number
  5. 8. capable of being divided with no remainders
  6. 11. a polygon's side or a solid figure's face by which the figure is measured or named
  7. 13. the set of whole numbers and their opposites
  8. 14. the point where two axes of a coordinate plane intersects(0,0)
  9. 17. a tool used to construct circles and arcs
  10. 18. the vertical number line on a coordinate plane