Math Problem (Level 2) : A circle moves around a figure (JJ40)

There is a figure made with five squares whose lengths of one side are 4 cm as shown in a figure.

A circle 1 cm in radius rotates without separating from the side of the figure and move one round on the outside of this figure.

Find the area of the portion along which the circle passed.

Pi is assumed to be 3.14.

Answer

104.26 cm²

Reference