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