The base of a triangle is 4dm, the height is 3dm, what is the area dm**2.
一个三角形的底是4dm，高是3dm，面积是多少dm**2．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 4 * 3</gadget>
<output>6</output>

<result>6</result>