What is the area of a triangle whose base is 9 cm long and whose height is 6 cm?
一个三角形底长9cm，高是6cm，它的面积是多少．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>