What is the area of a triangle whose height is 5 cm and base is 10 cm?
一个三角形的高是5厘米，底是10厘米，它的面积是多少．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>