Across
- 3. A line that divides a line or an angle into two equivalent parts
- 5. At equal distances.
- 8. The point where the perpendicular bisectors of the sides of that particular triangle intersect
- 11. A quadrilateral with two pairs of parallel sides
- 12. The result of multiplying a number by itself
- 14. A quadrilateral with reflection symmetry across one of its diagonals
- 15. A line segment through a vertex and perpendicular to a line containing the side opposite the vertex.
- 16. A quadrilateral with both pairs of opposite sides parallel and all sides the same length
- 18. A closed 2-D shape, having 4 sides, 4 corners, and 4 right angles (90°).
- 19. The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.
Down
- 1. Center Point of an object
- 2. A line segment which bisects another line segment at 90 degrees
- 4. Having all its sides of the same length.
- 6. The center of the incircle of a triangle or other figure.
- 7. The common intersection of the three altitudes of a triangle or their extensions or of the several altitudes of a polyhedron provided these latter exist and meet in a point.
- 9. Quadrilaterals that have two parallel sides and two non-parallel sides
- 10. The middle number in a sorted list of numbers
- 13. Having equal angles.
- 17. A straight line joining two opposite corners of a square, rectangle, or other straight-sided shape.