# The lateral edge of the parallelepiped

A parallelepiped is a prism whose bases are parallelograms. In other words, a parallelepiped is a polyhedron with six faces. Each face is a parallelogram. The correct parallelepiped is when all its angles are 90 degrees.

**Find the side edge of a regular parallelepiped knowing the length of the edge and the diagonal**

**Length of the parallelepiped edge a**

**Length of the parallelepiped edge c**

**The diagonal of the parallelepiped d**