For a washing machine, the length and width of the bottom surface are 56 cm, and the height is 80 cm. To make a waterproof cloth cover for the washing machine, what is the minimum area of the waterproof cloth required?
一种洗衣机，底面长和宽都是56厘米，高是80厘米，要给洗衣机做一个防水布罩，至少需要多大面积的防水布？
<gadget id="calculator">56 * 56</gadget>
<output>3_136</output>

<gadget id="calculator">56 * 80 * 4</gadget>
<output>17_920</output>

<gadget id="calculator">3_136 + 17_920</gadget>
<output>21_056</output>

<result>21_056</result>