The base of a triangle is 8.6 meters and the height is 5 meters. What is its area?
一个三角形的底是8.6米，高是5米，它的面积是多少．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">8.6 * (5/2)</gadget>
<output>21.5</output>

<result>21.5</result>