A parallelogram sign has a base of 80cm and a height of 40cm. What is the area of the sign in square centimeters?
一个平行四边形指示牌，底是80cm，高是40cm，这个指示牌的面积是多少平方厘米？
<gadget id="calculator">80 * 40</gadget>
<output>3_200</output>

<result>3_200</result>