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Calculate the shadow area in the third grade mathematics of primary school.
It can be calculated in two ways: cross section: 6 * 2+2 * 2 =12+4 =16cm2.

Vertical cutting: or 4x2+(6-2) x2 = 8+8 = 16 cm2.

Large rectangle-blank rectangle = 6 * 4-(6-2) x (4-2) = 24-4 * 2 = 24-8 =16cm2.

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