What is the area of a triangle whose base is 5 cm and whose height is h cm?
一个三角形的底是5厘米，高是h厘米，面积是多少．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>