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Across 2. to move a shape without rotating or flipping it. 7. the sum of all the areas of all the shapes that cover the surface of the object 9. a pattern that you can cut and fold to make a model of a solid shape 10. two angles that add up to 90 degrees 12. any of the individual surfaces of a solid object 15. the point of intersection of the x and y axis 16. a line that crosses at least two parallel lines 18. a shape having eight sides 19. the common endpoint of two or more rays of a line segment

Down 1. next to 3. divides a figure into two same shapes 4. a line that linkstwo points on a circle or curve 5. Any of the 4 equal areas made by dividing a plane by an x and y axis (as shown). They are usually numbered I, II, III and IV 6. a line touching a circle on the outside at one point 8. the distance around the outside of a circle 11. He developed the theorem a squared plus b squared = c squared 13. Circles that have their centers at the same point 14. three or more points that lie on the same straight line 17. The change in the rise/run