## Hila Science Camp

## Dome Background

The ancient Greeks developed the area of math known as geometry. Using this branch of math they described five regular solids called thePlatonic Solids.The

tetrahedronhas 4 sides.

Thehexahedron(cube) has 6 sides.

Theoctahedronhas 8 sides.

Thedodecahedronhas 12 sides.

Theicosahedronhas 20 sides.

The icosahedron divides very easily in the middle as shown here. Note the new triangles combine to create pentagons (grey), connected by triangles (white). This hemisphere is made up of 6 pentagons joined with 10 triangles. Each pentagon is constructed with 5 triangles. This structure is still very angular, to make it more "dome like" it is necessary to reshape the structure by moving each "hub" (point where triangles meet) outward.

Our dome starts with anicosahedron.

To make our dome more spherical we divide each triangular face of the icosahedron into 4 triangles.

Go to model dome construction page.

Page created at: Hila Science Camp: http://hilaroad.com