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Across 2. a three-dimensional solid that is perfectly round 5. two lines that intersect to form right angles 7. a polygon with 8 sides 8. a four-sided polygon 9. a quadrilateral with two pairs of parallel sides; opposites sides and angles are equal 10. a closed figure formed by line segments that meet only at their endpoint 13. arranged from smallest to largest 14. a solid figure having a base that is a triangle, rectangle, or other polygon. faces meet at a common point 16. when a figure is flipped across a line (mirror image) 18. an angle that measures 90 degrees 19. a solid with six faces that are rectangles

Down 1. a method of showing points in a plane using two coordinates in an ordered pair 3. the number that is the ratio of the circumference of a circle to its diameter 4. a pyramid whose base is a rectangle 6. when a figure is turned around a point or axis 11. a polygon with 5 sides 12. not flat but has volume, a three-dimensional object 14. a figure that lies on a flat surface 15. a shape with four sides and four right angles 17. having the same shape but not the same size