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

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>