The area of a triangle is 1 square meter, the base is 1 meter, and the height is in meters.
一个三角形的面积是1平方米，底是1米，高是多少米．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<result>2</result>