geometry

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Across
  1. 2. a line that bisects a line segment into 2 equal parts creating a right angle
  2. 4. the center of the incircle of a triangle
  3. 6. the point where all the three altitudes of a triangle intersect
  4. 9. the height of an object or point
  5. 10. a quadrilateral whose four sides can be grouped into two pairs of equal length sides
  6. 12. a four sided plane with opposite sides parallel
  7. 13. a ray that divides an angle into two equal pieces
  8. 14. a plane figure with four straight sides and one unequal pair of adjacent sides
  9. 15. any parallelogram with equal sides
  10. 17. the center of mass of a object
  11. 18. joining two opposite corners of a square
Down
  1. 1. a quadrilateral with only one pair of parallel sides
  2. 3. having all its sides of the same length
  3. 5. having equal angles
  4. 7. equal distance
  5. 8. the point at which the perpendicular bisectors of a triangle intersect
  6. 11. a shape with 2 pairs of equal sides
  7. 16. midpoint of a frequency