Across
- 4. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides
- 6. a type of quadrilateral, whose opposite sides are equal and parallel
- 8. a line that passes through two very specific points on a triangle: a vertex, or corner of a triangle, and its opposite side at a right, or 90-degree, angle
- 12. the arithmetic mean position of all the points in the surface of the figure.
- 14. the point at which the three perpendicular bisectors of the sides of a triangle intersect and which is the same distance from each of the three vertices of the triangle.
- 15. the intersection point of the altitudes drawn from the vertices of the triangle to the opposite sides
- 17. a line that splits an angle into two equal angles
- 18. quadrilaterals that have two parallel sides and two non-parallel sides
Down
- 1. a line that bisects a line segment in two equal parts and makes an angle of 90 degrees at the point of intersection
- 2. all the sides are the same length
- 3. a four-sided plane rectilinear figure with opposite sides parallel
- 5. a plane figure with four equal straight sides and four right angles.
- 7. A kite is a quadrilateral with reflection symmetry across a diagonal
- 9. a point which is at the same or equal distance from two given points
- 10. the middle value in a set of data
- 11. the single point in which the three bisectors of the interior angles of a triangle intersect and which is the center of the inscribed circle
- 13. a straight line that joins two opposite corners of a four-sided flat shape
- 16. having all or corresponding angles equal