The height of a triangle is 4.1 meters, and the length is 0.5 meters shorter than the base. What is the area in square meters?
一个三角形的高是4.1米，比底短0.5米，面积是多少平方米．
<gadget id="calculator">4.1 + 0.5</gadget>
<output>4.6</output>

<gadget id="calculator">4.1 / 2</gadget>
<output>2.05</output>

<gadget id="calculator">4.6 * 2.05</gadget>
<output>9.43</output>

<result>9.43</result>