Geometry

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Across
  1. 2. segment joining two nonconsecutive vertices of a convex polygon
  2. 3. segment whose endpoints are the vertex and the midpoint of the opposite side
  3. 4. distance around a geometric figure
  4. 5. equilateral parallelogram
  5. 7. parallelogram with one pair of parallel sides
  6. 9. points lying on the same plane
  7. 10. quadrilateral with both pairs of opposite lines parallel
  8. 13. no sides of the triangle are equal
  9. 16. segments enclosing the shape
  10. 17. line that intersects two or more coplanar lines at different points
  11. 18. angle larger than 180 degrees
Down
  1. 1. line that splits a triangle into two equal triangles
  2. 4. statement assumed to be true without proof
  3. 5. parallelogram with four right angles
  4. 6. parallelogram with four congruent sides and four congruent right angles
  5. 8. the number of square units enclosed in a geometric figure
  6. 11. perpendicular segment from the vertex of the triangle to the line containing the opposite side
  7. 12. equilateral and equiangular
  8. 14. all sides of a triangle are equal
  9. 15. when three or more lines intersect at one point