If the lengths of the two sides of a right triangle are 32 meters and 20 meters respectively, what is the area in square meters?
直角三角形两条直角边的长分别是32米、20米，面积是多少平方米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">32 * 10</gadget>
<output>320</output>

<result>320</result>