giả sử chiều cao là 3 chièu rộng là 5 chiều dài là 6
thì khi tăng lên chiều cao là
3 * 3 = 9
diện tích xung quanh lúc đầu là
( 5 + 6 ) * 3 = 33
diện tích xung quanh khi chiều cao tăng lên là
( 5 + 6 ) * 9 = 99
diện tích xung quanh khi chiều cao tăng lên gấp số lần lúc ban đầu là
99 : 33 = 3 ( lần )
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