1. A Look Into 4th Grade Geometry By: Bev Netusil

3. Triangles

4. Squares

5. Rectangles

6. Circles

7. Polygons

8. Triangles

9. Quadrilaterals

10. Pentagon

11. Hexagon

14. Leg or Side: these are the lines that connect the vertices. There are always three sides on a triangle

15. Base: this is the bottom of the triangle.

17. Squares Rectangles Shapes Con’t I have 2 sets of equal sides All my sides are equal It is important to recognize the differences between squares and rectangles.

19. Radius: this is the distance from the centre point to any point on the circumference.

20. Diameter: this is the entire distance from one side of the circle to the other. The diameter is twice the distance of the radius.

22. Can you name and recognize different polygons? Naming and Recognizing Polygons Am I a simple or complex polygon? What’s my name? What’s my name, and what kind of polygon am I?

24. 4 sides – quadrilateral

25. 5 sides – pentagon

26. 6 sides – hexagon

27. 7 sides – heptagon

28. 8 sides – octagon

29. 10 sides - decagonAre these the only polygons? No!Polygons can have an infinite number of sides. Can you name them all? Naming Polygons I have 6 sides, therefore, I must be a hexagon! I have 10 sides, therefore, I must be a decagon! BONUS* The shapes above are known as simple polygons. Do you remember what a complex polygon looks like?

32. Q&A Con’t Is it on a plane? Or is it 2-Dimensional? In other words if you laid it in front of you would it lay flat? If the answer is yes then you can move on to the next question! YES NO

33. 2. Do all the sides connect? In other words are there no holes within the shape? If the answer is yes then you can move on to the next question! Q&A Con’t NO YES

34. Does it have three or more sides? If you answer yes again then this shape is a polygon! That’s all! 3 Simple questions and now you can identify a polygon! Q&A Con’t NO YES NO

36. So a 3-Dimensional object exists in three dimensions. Well that definition is not very helpful. What is three dimensions? Well a 3-Dimensional object has depth. Refer back to polygons. These objects had a width and a length. 3-D objects will have width, length ANDdepth. Use a box as an example! *See how this box has a length, width and depth. * A 3-D object will never lie flat. If you place it on a desk it will stand out from the desk.

40. What are Prisms? A prism is a polyhedron with two congruent and parallel faces. Basically if you take two of the same polygons and connect them so that they are parallel you will get a prism. Here is an example,

41. Types of Prisms Try to use your knowledge of polygons to identify these prisms... Do you recognize this prism? It’s a cylinder! This is a pentagonal prism This is a triangular prism *BONUS: add ‘al’ to the end of polygon names plus ‘prism’ at the end to name the types of prisms. There are two exceptions and they are rectangular and triangular prisms.

44. Have students produce polygons and create a design using each polygon to create a new school flag.http://www.aaamath.com/g4_318x1.htm http://www.aaamath.com/g4_318x2.htm

45. Geometry Activities Con’t 3-Dimensional Objects Have students cut out this model and fold it into a cube! There are outlines like these all over the internet! Let your students explore which 3-D shapes they can make. http://www.korthalsaltes.com/

46. Here’s Some Extra Bonus Help! Get these books to help add to your geometry unit!! Use this slideshow to aid your students with geometry shapes, polygons and 3-Dimensional objects, or for your own teaching reference!