If the area of a square is 20 square centimeters, what is the area if its side length is tripled?
一个正方形的面积是20平方厘米，把它的边长扩大3倍后，面积是多少．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">20 * 9</gadget>
<output>180</output>

<result>180</result>