What is the area of a triangular cardboard whose base is 10 decimeters and whose height is 7 decimeters?
一个底是10分米，高是7分米的三角形纸板，它的面积是多少平方分米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">10 * (7/2)</gadget>
<output>35</output>

<result>35</result>