What is the area of a triangle whose base is 5 cm and whose height is 7 cm?
一个三角形底是5厘米，高是7厘米，面积是多少平方厘米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">5 * (7/2)</gadget>
<output>35/2 = around 17.5</output>

<result>35/2 = around 17.5</result>