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A179591: Decimal expansion of the surface area of a pentagonal cupola with edge length 1.
16.579749752988...
The pentagonal cupola is the fifth of the Johnson solids. It has 15 vertices, 25 edges and 12 faces (5 triangles, 5 squares, 1 pentagon, 1 decagon). The formula for its surface area is rather involved compared to the formulas for its volume and circumradius.