If the base and height of a triangle are both 6 decimeters, what is the area in square decimeters?
一个三角形的底和高都是6分米，面积是多少平方分米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>