When you unroll the paper, students will see that the surface between the two bases is a rectangle when "unrolled" and that the formula simply adds the area of the bases to the area of the rectangle. Demonstrate this to your class by using a rolled-up piece of paper to create a cylinder use two paper circles (cut out beforehand) to fill in the bases. Indicate that the surface area for a cylinder equals the area of the two bases plus the area of the surface between the bases. Step 4: Now draw a cylinder and mark the dimensions with the radius at 3 feet and the height at 4 feet. Step 3: Demonstrate how to calculate total surface area for the rectangular prism you have drawn. Explain to them that the surface area of 3-D objects is measured in square units, just like the area of 2-D objects, and is the sum of all of the 3-D object's 2-D surfaces. Step 2: Show students the surface area formula for rectangular prisms on the Setting the Stage With Geometry Classroom Poster: SA= 2 ( l Point out that opposite surfaces have the same area. Ask students to calculate the area of one of the surfaces, say 5 x 4 = 20 square feet. Step 1: Draw a rectangular prism on the board with these measurements: height = 3 feet, length = 4 feet, and width = 5 feet. Introduction to Formulas for Surface Area Optional: Make class sets of the Setting the Stage With Geometry Take-Home Activity: Covering Up! printable and the That's A Wrap! Bonus Worksheet printable for students to complete as part of the Lesson Extensions.Hang a copy of the Setting the Stage With Geometry Classroom Poster printable in your classroom or project it using a computer and projector.Print a copy of the Answer Key: Setting the Stage With Geometry printable.Make class sets of the Setting the Stage With Geometry Worksheet: That Should Cover It! printable and the Setting the Stage With Geometry Reference Sheet: Perimeter, Area, Surface Area, and Volume printable.Optional: Setting the Stage With Geometry Take-Home Activity: Covering Up! printable.Optional: That's A Wrap! Bonus Worksheet printable.Setting the Stage With Geometry Classroom Poster printable.Answer Key: Setting the Stage With Geometry printable.Setting the Stage With Geometry Reference Sheet: Perimeter, Area, Surface Area, and Volume printable.Setting the Stage With Geometry Worksheet: That Should Cover It! printable. ![]() Understand formulas used to measure the surface area of these basic 3-D shapes: a rectangular prism, a cylinder, and a square pyramid.Discuss math vocabulary such as polyhedron, face, edge, prism, etc. ![]() Once all the shapes are assembled, you can use them however you like, depending on the age of your kids! Learning ideas for foldable 3D shapes: You can also use tape if that’s easier for you (or you don’t have glue). This will help make sure it stays together. I suggest adding a few dabs of glue to each tab and then hold it in place for a few seconds before gluing the next tab. Then, carefully fold each tab so that it can be used to glue the shape together, and fold each side of the shape.įinally, glue each side together. This will help them see and learn math vocabulary. If your students are older, have them label the different parts of the shape (face, edge, base) before assembling to use as a reference throughout their study of shapes! □ If you’ve printed on white card stock as I have, take some time to get creative and color or decorate the shapes before assembling them! This could make a great math art project! I have tried it both ways, and regular paper is just too flimsy.Īfter printing, simply cut out the 3d shape nets on the solid lines. I highly recommend printing the nets on stock paper rather than regular paper.
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