Shapes
A general site for 3D shapes.
Open a shape, a comparison, or a calculator. The page draws the solid and the notes that belong to it.
Shape pages
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Calculator
Stair calculator
Set the floor-to-floor height and read the risers, the going, the pitch, and the stringer length.
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Comparison
Prism vs cube
See how a cube is a rectangular prism with equal edges, then compare the volume, the surface area, and the folded nets.
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Prism
Rectangular prism
Change the length, width, and height, then read the volume, the surface area, and the folded net.