4th grade geometry revised
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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
Tell Me What You KnowMake 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!
✴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.
*Shapes*
Classifying TrianglesI 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.
Squares & Rectangles
I am a square. I have 4 sides
that are all equal!
I am a rectangle. I have 4 sides
but have 2 sets of equal sides!
Always remember that shapes and rectangles are
different!!
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.
Circles✴ Diameter- distance from one
side of the circle to the other. It has to pass through the center and it is twice the radius.
✴ Circumference- distance around the circle
Have fun with shapes!!
✴Check out this link for a fun game using shapes!
Shape Reflection
✴ Write a reflection on what you have just learned about shapes for 3 minutes.
✴ Turn to your partner and share.
*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.
Irregular Polygons
WHY?
If you can answer yes to this question, it is a irregular polygon:Do their lines
cross?
Polygons Q&A Session
✴ Is it on a plane? Or is it 2-dimensional? (If you look at it, is it flat?)
Ask yourself the following questions if you are having trouble.
YESYES NONO
Polygons Q&A Session
✴ Do all of the sides connect? (Are there no holes in the shape?)
NONOYESYES
Ask yourself the following questions if you are having trouble.
Polygons Q&A Session
✴ Do they have 3 or more sides?
NONOYESYES YESYES
Ask yourself the following questions if you are having trouble.
Polygon Fun!✴Polygon Playground
is a great place to have fun and use what you learned about polygons!
Polygon Reflection
✴ Write a reflection on what you have just learned about polygons for 3 minutes.
✴ Turn to your partner and share.
*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)
✴ Sphere -> perfectly round ball
✴ Cube -> has 6 square sides
✴ Rectangular Prism -> has 6 rectangular sides
Naming 3-Dimensional Objects
3-Dimensional Object Match
Sphere
Cone
Cube
Square Pyramid
Draw a line from the word to its matching object
3D Objects: Prisms✴ Prisms are polyhedrons with 2
congruent and parallel faces.
✴ If you take two of the same polygons and connect them so that they are parallel, you will get a prism.
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 ‘al are added to the end of the polygon name
My base is a triangle so my
name is:Triangular
PrismMy base is a pentagon so my name is:Pentagonal
Prism
Fun with 3D Shapes!
✴Buried 3D Treasure Game
✴3D Shapes
✴3D Shape Match
3D Reflection
✴ Write a reflection on what you have just learned about 3D objects for 3 minutes.
✴ Turn to your partner and share.
Geometry Activities
✴ 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
(SHAPES)
Geometry Activities
✴ 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
(POLYGONS)
Geometry Activities
✴ 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
(3D OBJECTS)
Extra Help!✴ These books can
help with the unit on geometry in your classroom!
✴ These websites can help with this unit!
http://www.korthalsaltes.com/
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
iPads!✴ Geometry 4 Kids is a great tool
to use in the classroom for independent practice or even as an assessment.