If the two sides of a right triangle are 4dm and 6dm respectively, what is the area of the triangle?
一个直角三角形的两条直角边分别是4dm和6dm，这个三角形的面积是多少．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>