15 April 2017


\(5\) is the only prime number ending in $5$.

There are \(5\) platonic solids: tetrahedron, cube, octahedron, dodecahedron and icosahedron.

\(5\) is a congruent number because equates the area of a right-angled triangle whose side lengths are rational numbers: \(\frac{20}{3}\), \(\frac{3}{2}\) and \(\frac{41}{6}\).

A pentagon has \(5\) diagonals, being the only polygon where the number of sides is equal to the number of diagonals.

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