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A rectangular pyramid is a 3-dimensional object called a pentahedron. It has a rectangular base. To each side of the base are attached triangles that rise so as to meet at a single point above the base.
If, by base, you mean alkali, then 14.
the bottom of it
If you mean "altitude", and by that you mean the height of the top of the triangle above its base, then draw a line from the top of the triangle to the base, at right angles to the base, and measure that line. Alternately, the height of a triangle above its base is twice the area divided by the base length.
Halvah is a middle eastern confection made from a base of sesame seeds.