The area is 12*6 cm^2=72 cm^2, assuming Euclidean geometry.
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These windows could get extremely large, but let's play with Andersen Windows' catalog. If you build a Norman window using Andersen's largest semicircle window, which is six feet wide, and their tallest twin double-hung window, which is 6'4" high, you get an area of 52.11 square feet.
King is 76" wide by 80" long California King is 72" wide by 84" long Source: http://interiordec.about.com/od/buyingabed/a/a_bedsizes_3.htm
72" Wide x 84" Long
Approximately 24.7 cubic yards or 31.7 tons of gravel.
The measurements for a California King size bed frame is 183 cm/72 in wide and 213 cm/84 in long. It is slightly less wide but a little longer than a regular king size bed frame.