A Look Into 4th Grade Geometry

By: Bev NetusilRevised by: Michelle

New

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

Geometry Topics✴Shapes

✴ Triangles

✴ Squares

✴ Rectangles

✴ Circles

Geometry Topics

✴Polygons

✴ Triangles

✴ Quadrilaterals

✴ Pentagon

✴ Hexagon

Geometry Topics

✴3-Dimensional Shapes

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!

Let’s Get Started!!

✴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.

Classifying Triangles

I am an isosceles triangle

because two of my sides are the

same.

Classifying Triangles

I am a scalene triangle

because none of my sides

are the same.

Classifying Triangles

I am a right triangle. I have one 90 degree

angle.

Classifying Triangles

I am an obtuse triangle because one of my angles is greater than 90

degrees.

Classifying Triangles

I am an acute triangle because all of 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.

Naming Regular Polygons

3 sides

Triangle=

4 sides

Quadrilateral=

5 sides

Pentagon=

6 sides

Hexagon=

Naming Regular Polygons

7 sides

Heptagon=

9 sides

Nonogon=

8 sides

Octagon=

10 sides

Decagon=

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)

✴A box is an example of a 3D object. It has a length, width, and a depth.

*3-Dimensional Objects*

✴ 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.

Ticket Out The Door

✴ In your own words, give the definition of at least 3 terms discussed in this lesson.