Across
- 4. six-sided shape
- 10. the outline of a circle
- 11. two straight lines which never touch themselves
- 12. the highest point of a solid
- 13. line perpendicular to a line segment at its midpoint
Down
- 1. extremity of a solid
- 2. it's a point where straight lines intersect
- 3. figure closed and having many sides
- 5. an angle inferior at 90°
- 6. to have matching sides
- 7. dimension in the vertical direction, from the base to the top.
- 8. it's a triangle that has two equal sides
- 9. Line segment joining a vertex of a triangle to the midpoint of the opposite side.