The area of a triangle is 10m: If its base and height are doubled respectively, what is the area of this large triangle in m**2.
一个三角形的面积是10m：，如果把它的底和高分别扩大到原来的2倍，这个大三角形的面积是多少m**2．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>