2. Groovy Geometry Created by: Colleen Hill and Morgan Rockett 2010-2011

3. 2-D and Plane Figures

4. Polygon

5. A polygon is a closed plane figure made up of straight line segments. Can you name a polygon?

6. Triangle

7. A polygon with three sides. Tri means 3

8. Quadrilateral

9. A polygon with four sides. Quad means 4

10. Square

11. A quadrilateral with four equal sides Can you find a square in this room?

12. Rectangle

13. A quadrilateral that opposite sides are congruent (equal). Opposite sides are equal

14. Rhombus

15. A quadrilateral with opposite sides parallel, and all sides the same length. Tilted square

16. Parallelogram

17. A quadrilateral in which opposite sides are parallel.

18. Trapezoid

19. A quadrilateral with only one pair of parallel sides.

20. Pentagon

21. A polygon with five sides.

22. Hexagon

23. A polygon with six sides.

24. Octagon

25. A polygon with eight sides.

26. Decagon

27. A polygon with ten sides.

28. Angles

29. A figure formed by two rays that have the same end point.

30. Acute

31. An angle that measures less than 90 degrees.

32. Obtuse

33. An angle that measures more than 90 degrees.

34. Right

35. An angle that measures exactly 90 degrees. This angle forms a square corner.

36. Let’s Test Your Knowledge! Click Me!