20 cm. is almost as wide as the standard phone book. Or to put it in other terms, standard letter paper is 8 1/2 inches wide, or 21.5 cm.
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Perimeter = 25+20+25+20 = 90 cm
90
Multiply 20 x 15 x 78 = 23400 cubic cm = 1428 cubic inches
It is: 400/20*5 = 4 cm
volume = length x width x height = 20 x 10 x3 = 600 cubic cm