Across
- 2. one whose interior angles are all less than 180°; that is, any two points in a figure can be connected by a line segment that will be completely within the figure and all diagonals will remain inside the figure.
- 4. the study of the properties of figures that stay the same even under distortions, except tearing or cutting.
- 7. A nonconvex polygonal region
- 9. the movement of a figure about a line outside the figure, on a side of the figure, or intersecting with a vertex.
- 11. the points where edges of the shape meet
- 12. a flat region being covered with repetitions of the same figure without any overlapping.
Down
- 1. a seven-piece puzzle consisting of five triangles (2 large, 1 medium, and 2 small), one square, and one parallelogram cut from a square. These parts can be arranged to create different shapes, such as a rectangle, a large triangle, a boat, or a building.
- 3. two-dimensional figures with straight-line segments.
- 5. a movement along a straight line
- 6. a foundational subject to many other areas of mathematics, such as algebraic thinking involving patterns and problem-solving activities involving area and perimeter of geometric shapes. It also is about developing spatial sense—the ability to build and manipulate mental representations of two-and three-dimensional objects and perceive them accurately from different perspectives
- 8. three-dimensional shapes with faces consisting of polygons
- 10. changing an object. They can be achieved by twisting, bending, stretching, and shrinking