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geometry in 3 dimensionsPyramids

A pyramid has a base (usually a regular polygon) and a vertex above this base that is joined to all the vertices on the base.

Euler discovered a relationship between the faces, vertices and edges of these solids: vertices + faces = edges + 2.



Triangular based pyramid

Square based pyramid

Pentagonal based pyramid

JavaView: Help with diagrams
In every diagram you can click and drag the left mouse button to rotate each spae. Press your right mouse button to select different interaction modes from a popup menu, or use keyboard keys to temporarily switch between different modes (just keep a button pressed to switch mode temporarily). Some essential modes are:

o Rotate surface (this orbit mode is the default mode)
s scale surface, drag in vertical direction
t translate surface in viewing plane
r reset camera and display, object returns to default position
Right-Mouse Show control window