If two right triangles with a length of 20 cm and a width of 12 cm are used to form a rectangle, what is the area of the rectangle in square centimeters?
用2个长为20厘米，宽为12厘米的直角三角形拼成一个长方形，这个长方形的面积是多少平方厘米．
<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<result>240</result>