Cut a rectangular paper with a length of 6 decimeters and a width of 4 decimeters into two identical triangles. What is the area of each triangle?
把一个长6分米、宽4分米的长方形纸，剪成两个完全一样的三角形，每个三角形的面积是多少平方分米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<result>12</result>