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(55 cms) x (40 cms) x (20 cms) equals 2,685 cubic inches.
area of rectangle = base x height = 9 x 10 = 90 square cms
0.00431, approx.
Divide the product by (2.54x2.54x2.54)
It is pi x 15 x 15 = pi x 225 = 3.1415 x 225 = 706.84 square cms