Geometry Crossword

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Across
  1. 3. divides triangle into two equal area triangles
  2. 5. quadrilateral with sum of opposite angles 180
  3. 6. volume of cuboid
  4. 8. congruency two sides and an angle of two triangles
  5. 9. one-third of a cylinder
  6. 14. figure containing two triangles and a trapezium
  7. 16. A+B=90
  8. 17. quadrilateral with one pair of paralell sides
  9. 18. angle greater than 180,less than 360
  10. 19. angle in a semi-circle
Down
  1. 1. derived formula of area of triangle
  2. 2. circle with 3 vertices on its circumference
  3. 4. four angles, four vertices
  4. 7. two halves of the earth
  5. 10. shape with no edges
  6. 11. accurately measures angles
  7. 12. area between a chord and an arc
  8. 13. longest chord of the circle
  9. 15. same shape and size
  10. 16. points on the same line