A computer monitor is 35cm long, 20cm wide, and 30cm high. In order to prevent dust, it is necessary to make a cloth cover for this kind of monitor. How much cloth should be used in cm**2.
一种电脑显示器的长35cm，宽20cm，高30cm，为了防尘要给这种显示器做个布罩，要用布多少cm**2．
<gadget id="calculator">35 * 20</gadget>
<output>700</output>

<gadget id="calculator">35 * 30</gadget>
<output>1_050</output>

<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<gadget id="calculator">1_050 + 600</gadget>
<output>1_650</output>

<gadget id="calculator">1_650 * 2</gadget>
<output>3_300</output>

<gadget id="calculator">700 + 3_300</gadget>
<output>4_000</output>

<result>4_000</result>