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A polyhedron (plural polyhedra or polyhedrons) is a closed geometric shape made entirely of polygonal sides.

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Classroom Resources - National Council of Teachers of Mathematics

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MS College and Career Readiness Standard: Grades 6th-7th

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MS College and Career Readiness Standard: Grades 6th-7th

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6.G.3

Draw polygons in the coordinate plane given coordinates for the vertices; use coordinates to find the length of a side joining points with the same first coordinate or the same second coordinate. Apply these techniques in the context of solving real-world and mathematical problems.

6.G.4

Represent three-dimensional figures using nets made up of rectangles and triangles, and use the nets to find the surface area of these figures. Apply these techniques in the context of solving real- world and mathematical problems.

7.G.3 | Describe the two-dimensional figures that result from slicing three-dimensional figures, as in plane sections of right rectangular prisms and right rectangular pyramids.

7.G.6 | Solve real-world and mathematical problems involving area, volume and surface area of two- and three-dimensional objects composed of triangles, quadrilaterals, polygons, cubes, and right prisms.

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Tripp, K. (2019, July 17). Making Platonic Solids (3-D Shapes) With Straws and Pipe Cleaners. Teach beside Me. https://teachbesideme.com/making-platonic-solids-with-straws-and-pipe-cleaners/

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SUPPLIES TO MAKE THE PLATONIC SOLIDS OR 3D SHAPES:

Paper Straws, Pipe Cleaners, & Scissors

STEPS:

1. Cut all of your straws in half. To make the first shape, a triangular pyramid or a tetrahedron, you will need 6 straw halves and 3-4 pipe cleaners. Begin by making a triangle.
2.Thread the pipe cleaner through three straw pieces.  Twist them together at the top point. At each point of the triangle attach another straw piece. When you run out of pipe cleaner, just twist another one to the end of the last one. Connect the next three pieces at the top to make the tetrahedron.
3. Next, make the cube in the same fashion. Make a square first, then attach a piece going upward at each corner.
4. Lastly make a dodecahedron in the same manner. Start with a pentagon, then from each angle, add another pipe cleaner and straw to build upward.
5. These can be places inside of each other and nested.  You could even hang them all together with a string.

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Making Platonic Solids (3-D Shapes) With Straws and Pipe Cleaners

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Geometry Nets Information Page. (n.d.). Math Salamanders. https://www.math-salamanders.com/geometry-nets.html

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With this worksheet activity they will match each unfolded net to the correct shape it will form. This will help with being able to fully think through how many sides, faces, etc each shape has. This is another great option to help the students learn their polyhedras.