A cuboid has a length of 20 cm, a width of 15 cm, and a height of 12 cm. What is the surface area of this cuboid in square centimeters?
一个长方体的长是20厘米，宽是15厘米，高是12厘米．这个长方体的表面积是多少平方厘米？
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">300 + 240 + 180</gadget>
<output>720</output>

<gadget id="calculator">720 * 2</gadget>
<output>1_440</output>

<result>1_440</result>