Draw a triangle in a parallelogram with a base of 16 cm and a height of 5 cm. What is the maximum area of this triangle in square centimeters?
在一个底是16厘米，高5厘米的平行四边形内画一个三角形，这个三角形的面积最多是多少平方厘米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">16 * (5/2)</gadget>
<output>40</output>

<result>40</result>