Dodecahedron

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What is the mathematical formula used to determine the area inside a pentadodecahedron?

A penta-dodecahedron is the same as a Dodecahedron which has twelve faces consisting of equal pentagon surfaces. The volume of a Dodecahedron, if the length of one side of a pentagon is equal to "a", will be close to 1 ⁄ 4 × (15 + 7 × √5) × a³ ≈ 7.663118961 × a³ Since 7.663118961 is an approximate number and the square root of 5 is approximately 2.236 this formula can only be close


Formulas and calculators

http://www.aqua-calc.com/calculate/volume-dodecahedron

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