If the base of a triangle is 2.4 cm and the height is 3.1 cm, what is its area in square centimeters?
一个三角形的底是2.4厘米，高是3.1厘米，它的面积是多少平方厘米．
<gadget id="calculator">3.1 / 2</gadget>
<output>1.55</output>

<gadget id="calculator">2.4 * 1.55</gadget>
<output>3.72</output>

<result>3.72</result>