If the two sides of a right triangle are 5 meters and 7 meters long, what is the area of the right triangle?
一个直角三角形的两条直角边长分别是5米和7米，这个直角三角形的面积是多少平方米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">5 * (7/2)</gadget>
<output>35/2 = around 17.5</output>

<result>35/2 = around 17.5</result>