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What you will make -
In this project make three of the five Platonic solids—tetrahedron, octahedron, and icosahedron. The
tetrahedron is easy to make, while the icosahedron can be hard for
children under ten. Make the tetrahedron first before trying to make
either of the other two solids.
These geometric models can be used for things beyond learning about solid geometry.
Decorate them and make a colorful mobile with a paper plate and some
string. Use them as Christmas tree decorations, or use one as a giftbox and put a small gift
Geometric solids are three dimensional objects like
spheres, cones, and cubes. Solids with only flat surfaces and straight
lines are known as polyhedra. There are many different polyhedra, but
five of them have the property of being regular. A solid is regular if
all faces are the same and the same number of planes (faces) meet at
each corner (vertex). Five solids qualify as regular (also called
Platonic)—three based on triangles (tetrahedron, octahedron, and
icosahedron), one based on squares (cube), and one based on regular
The solids in this project are all based on equilateral triangles. The tetrahedron has
four sides (or faces), while the octahedron has eight and the icosahedron has twenty. The tetrahedron
has three triangles that meet at each corner (or vertex). Four triangles meet at each corner of an octahedron,
and five triangles meet at each corner of an icosahedron. Examine your models to see these properties.
Here's what you need -
- Card stock, plain or colored
- Glue or double-sided tape
- Bone folder or empty ballpoint pen
This project is rated EASY to AVERAGE to do.