A cuboid goldfish bowl is 8 decimeters long, 5 decimeters wide, and 7 decimeters high. The glass behind it is accidentally broken. What is the area of the glass used for repair?
一个长方体的金鱼缸，长是8分米，宽是5分米，高是7分米，不小心后面的玻璃被打坏了，修理时配上的玻璃的面积是多少平方分米．
<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<result>56</result>