How Many Triangles?
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Answer
20
(or 40 if you count the reflection)
As the title suggests, the shape is a regular icosahedron, one of the five Platonic solids. It is a polyhedron composed of 20 triangular faces, with five meeting at each of the 12 vertices connected by 30 edges.
Can you sketch a net for this shape?
Have you seen the Great Dodacahedron?
Other shape counting starters:
How Many Squares 1?
| How Many Squares 2?
How Many Triangles 1?
|
How Many Triangles 2? | How Many Triangles 3?
How Many Rectangles?
| Rectangles Investigation |
Icosahedron
The animation at the top of this page was adapted from one created by Ramandeep Singh and made available on www.Flashkit.com