1. A Look Into 4th Grade
Geometry
By: Bev Netusil
Revised by: Michelle New

2. What’s In This Unit?
✴ Name and create shapes
✴ Label parts of shapes
✴ Name triangles
✴ Understand 3-Dimensional objects
✴ Using polygons to create 3-D objects
✴ Name and create 3-D objects

3. Geometry Topics
✴ Shapes
✴ Triangles
✴ Squares
✴ Rectangles
✴ Circles

4. Geometry Topics
✴ Polygons
✴ Triangles
✴ Quadrilaterals
✴ Pentagon
✴ Hexagon

5. Geometry Topics
✴ 3-Dimensional Shapes

6. Tell Me What You Know
• Make a list of anything and everything
you know about any of these topics! You
have 5 minutes...GO!
• When we’re done, I am going to take our
answers and create a “wordle” about
geometry!

7. Let’s Get Started!!

8. *Shapes*
✴ Triangles
✴ Vertex/Vertices- points of the
triangle. A triangle will always have 3.
✴ Legs or Sides- lines that connect the
vertices. There are always 3 sides to a
triangle.
✴ Base- bottom of the triangle.
✴ Angles- these help determine which
type of triangle it is: equilateral,
isosceles, or scalene.

9. Classifying Triangles
I am an equilateral
triangle. All 3 of my sides
are equal. I am also an
acute triangle because all
my angles are less than 90
degrees.

10. Classifying Triangles
I am an isosceles
triangle because two
of my sides are the
same.

11. Classifying Triangles
I am a scalene
triangle because
none of my sides
are the same.

12. Classifying Triangles
I am a right triangle. I
have one 90 degree
angle.

13. Classifying Triangles
I am an obtuse triangle
because one of my
angles is greater than
90 degrees.

14. Classifying Triangles
I am an acute triangle
because all of my angles
are less than 90
degrees.

15. Squares & Rectangles
I am a square. I Always remember that shapes and
have 4 sides that rectangles are different!!
are all equal!
I am a rectangle. I
have 4 sides but
have 2 sets of equal
sides!

16. Circles
✴ Center- in the center of the circle.
The distance from this point to any
other point on the circle is the same.
✴ Radius- distance from the center to
any other point on the circumference.

17. Circles
✴ Diameter- distance from one side of
the circle to the other. It has to pass
through the center and it is t wice the
radius.
✴ Circumference- distance around the
circle

18. Have fun with shapes!!
✴Check out this link for a
fun game using shapes!

19. Shape Reflection
✴ Write a reflection on what you have
just learned about shapes for 3
minutes.
✴ Turn to your partner and share.

20. *Polygons*
✴ A polygon is:
✴ a plane shape (2 dimensional) with straight
sides that MUST connect.
✴ In a simple or regular polygon, none of the sides
overlap.
✴ In a complex or irregular polygon, the sides
overlap.
✴ NOTE: a circle is NOT a polygon because it has a
curved side.

21. Naming Regular Polygons
4 sides
3 sides =
Quadrilateral
=
Triangle
5 sides 6 sides
= =
Pentagon Hexagon

22. Naming Regular Polygons
7 sides 8 sides
= =
Heptagon Octagon
9 sides 10 sides
= =
Nonogon Decagon

23. Irregular Polygons
WHY?
If you can answer yes to this question, it is a irregular polygon:
Do their lines cross?

24. Polygons Q&A Session
Ask yourself the following questions if you are having trouble.
✴ Is it on a plane? Or is it 2-dimensional?
(If you look at it, is it flat?)
YES NO

25. Polygons Q&A Session
Ask yourself the following questions if you are having trouble.
✴ Do all of the sides connect?
(Are there no holes in the shape?)
YES NO

26. Polygons Q&A Session
Ask yourself the following questions if you are having trouble.
✴ Do they have 3 or more sides?
YES NO
YES

27. Polygon Fun!
✴Polygon Playground is a
great place to have fun
and use what you learned
about polygons!

28. Polygon Reflection
✴ Write a reflection on what you have
just learned about polygons for 3
minutes.
✴ Turn to your partner and share.

29. *3-Dimensional Objects*
✴3-Dimensional or “3D” objects have 3
dimensions.
✴3-dimensions mean that they have
depth.
✴3D objects have a length, width, and
depth. (2D has only a length and width)

30. *3-Dimensional Objects*
✴A box is an example of a 3D object. It has a
length, width, and a depth.

31. Naming 3-Dimensional Objects
✴ Sphere -> perfectly round ball
✴ Cube -> has 6 square sides
✴ Rectangular Prism -> has 6 rectangular
sides

32. 3-Dimensional Object Match
Draw a line from the word to its matching object
Sphere
Cone
Cube
Square Pyramid

33. 3D Objects: Prisms
✴ Prisms are polyhedrons with 2 congruent and
parallel faces.
✴ If you take t wo of the same polygons and connect
them so that they are parallel, you will get a
prism.

34. 3D Objects: Prisms
✴ Prisms are named for the shape of their base.
✴ Use the names of the polygons learned earlier to
help name the prisms.
✴ ‘ar or ‘ l are added to the end of the polygon name
a
My base is a
triangle so my
name is:
Triangular Prism
My base is a
pentagon so my
name is:
Pentagonal Prism

35. Fun with 3D Shapes!
✴Buried 3D Treasure Game
✴3D Shapes
✴3D Shape Match

36. 3D Reflection
✴ Write a reflection on what you have
just learned about 3D objects for 3
minutes.
✴ Turn to your partner and share.

37. Geometry Activities
(SHAPES)
✴ Have students draw and label shapes.
✴ Cut out shapes in different colored
paper and let the students make shape
creatures!
✴ Use the shape cut outs or manipulatives
to create a shape puzzle.
✴ Online games or smartboard games

38. Geometry Activities
(POLYGONS)
✴ Students can cut out different polygons
out of construction paper and glue them
to string or yarn to make necklaces.
✴ Challenge the students to create an
animal or some type of object using just
the polygon cut outs.
✴ Online games or smartboard games

39. Geometry Activities
(3D OBJECTS)
✴ Students can create the nets for the 3D
objects and then build their own 3D
objects.
✴ Create a 3D shape town!
✴ Online games or smartboard games

40. Extra Help!
✴ These books can ✴ These websites can
help with the unit help with this unit!
on geometry in http://www.korthalsaltes.com/
your classroom! http://www.aaamath.com/g4_318x2.htm
http://www.aaamath.com/g4_318x1.htm
http://www.freemathhelp.com/geometry.html
http://www.education.com/activity/fourth-grade/geometry/
http://mrsrenz.net/mathsites.htm#geom

41. iPads!
✴ Geometry 4 Kids is a great tool to use
in the classroom for independent
practice or even as an assessment.

42. Ticket Out The Door
✴ In your own words, give the definition
of at least 3 terms discussed in this
lesson.