The base of a triangle is 8cm, and the base is twice the height. What is the area of the triangle?
一个三角形的底是8cm，底是高的2倍，这个三角形的面积是多少．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>