If a triangle is enlarged by a ratio of 1:2, how many times its original area will be.
将一个三角形按1：2的比放大后，面积是原来的多少倍．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<result>4</result>