Below this paragraph is a link to a Geometry PowerPoint that I created a number of years ago. I came across it as I was going through my math materials and decided to share. I remember it took a L-O-N-G time to create. The PowerPoint may feel a little choppy because I went through and deleted the slides that were textbook specific. I also had my students create a foldable graphic organizer with formulas for their interactive notebooks. Since I couldn’t find the exact organizer that went with the slides, I deleted those slides as well. Even with all the deleted slides the PowerPoint still contains 116 slides with eight lessons. It is not locked, so it can easily be changed to meet your needs.
Geometry [Perimeter, Area, and Volume]
Here is a little more explanation for some of the activities that are included in the PowerPoint:
Give each student 12 stick pretzels. Have them imagine the pretzels are sections of fencing. Have them “build” a fence for their puppy using the pretzels. Draw out the finished results on grid paper.
Use the same pretzels to make a different fence configuration. Draw out the finished results. Have students count the boxes inside the fence “area” to determine which fence gives the puppy the most space.
I placed the students into small groups. Each group was given three different sizes of card stock: 6 by 6 inches, 7.5 by 4.5 inches, and 6.5 by 5.5. Each piece of card stock was to become a different greeting card. Students first folded each piece of card stock so that it would open like a card. (I encouraged students to be creative with folding. Only one fold was allowed, but the finished card could be a triangle, have a front that was a different size than the back, etc.) First students had to determine if folding the piece of card stock different ways would give the card different perimeters. The challenge was to figure which card would take the least amount of material to decorate if you added a decorative ribbon, lace, beads, etc. around the perimeters of the fronts of the cards. After calculating, students created the greeting cards. Students really enjoyed this.
This is the Cheez-It area activity that has been around for years. Print the printable in the link above. Students simply place the Cheez-Its on the rectangle and square shapes to determine the area of each. NOTE: Cheez-Its are approximate one inch square.
Students really “see” why the area of a parallelogram is the same as the area of a rectangle if you have them cut the triangle off one end of the parallelogram and move it to the opposite side to turn the parallelogram into a rectangle.
I teach in Tennessee, so comparing its shape to a parallelogram is interesting. If you don’t live in Tennessee, you may want to delete this slide.
This one is pretty self-explanatory. We constructed bridges out of Popsicle sticks. Students calculated the area of the sides and base.
Here are some links to additional online resources for teaching geometry:
- Everything You Wanted to Know about Area and Perimeter
- Area and Perimeter Resources
- Perimeter Worksheets
- Lesson Plan for Area and Perimeter
Are you looking for additional math resources? Each of these blog posts contains free math materials: