A triangular lawn has a base length of 6.4 meters and a height of 3.5 meters. What is the area of the lawn?
一块三角形草坪的底长6.4米，高3.5米，这块草坪的面积是多少？
<gadget id="calculator">3.5 / 2</gadget>
<output>1.75</output>

<gadget id="calculator">6.4 * 1.75</gadget>
<output>11.2</output>

<result>11.2</result>