The area of a triangle is 4 square centimeters, what is the area of the figure when it is doubled?
一个三角形的面积为4平方厘米，把这个图形扩大2倍后的面积是多少平方厘米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>