ABCD is a square of side 21 cm. A circle is inscribed in the square, which touches the sides of the square at P, Q, R and S as shown below in the figure. What is the area (in $$cm^{2}$$) of the non-shaded region? [Figure is not drawn to scale.]

($$\pi = \frac{22}{7}$$)

A

88.4

B

84.6

C

90.7

D

94.5