math

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Across
  1. 4. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
  2. 6. a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.
  3. 8. the height of an object or point in relation to sea level or ground level.
  4. 12. the center of mass of a geometric object of uniform density.
  5. 14. a point equidistant from all three vertices and defined as the point where the triangle's three perpendicular bisectors intersect
  6. 15. the point of concurrency of the three altitudes of a triangle
  7. 17. a line that splits an angle into two equal angles.
  8. 18. a quadrilateral with only one pair of parallel sides.
Down
  1. 1. a line that bisects a line segment in two equal parts and makes an angle of 90 degrees at the point of intersection
  2. 2. having all its sides of the same length.
  3. 3. a four-sided plane rectilinear figure with opposite sides parallel.
  4. 5. a plane figure with four equal straight sides and four right angles.
  5. 7. a quadrilateral with reflection symmetry across one of its diagonals.
  6. 9. at equal distances.
  7. 10. the middle number in a sorted list of numbers
  8. 11. the center of the incircle of a triangle or other figure.
  9. 13. (of a straight line) joining two opposite corners of a square, rectangle, or other straight-sided shape.
  10. 16. having equal angles.