Geometry

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Across
  1. 2. two lines intersect then the opposite angels are equal
  2. 4. Triangles quadrilaterals pentagons and hexagons are
  3. 6. Three sided polygon that has three edges and three vertices
  4. 8. happening at the same time of point
  5. 9. closed and flat shape with four shape made of straight lines
  6. 10. 2-D shape with four sides hence termed as a quadrilaterial
  7. 12. similar or fit together well
  8. 15. lines that are not parallel and do not intersect
  9. 16. symmetry line that cuts a shape exactly in half
  10. 17. Location represented by a dot
  11. 18. The highest point the top one apex
  12. 19. a four sided figure
Down
  1. 1. to divide it into two equal angles
  2. 3. flat surface of two dimensions
  3. 5. measure 10 units makes two line segments of 5 units each
  4. 7. any of a set of straight lines passing through one point
  5. 9. The outer edge of a flat shape or area
  6. 11. Acting lying or being across
  7. 13. bounded by two distinct points on a line
  8. 14. a long narrow mark or band