There are one small stick each with a length of 3cm, 4cm, 5cm and 6cm. Choose three of them to form a triangle. This triangle happens to be a right triangle. What is its area in cm**2.
有长度是3cm、4cm、5cm和6cm的小棒各一根，从中选出三根可以围成一个三角形，这个三角形恰好是一个直角三角形，它的面积是多少cm**2．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>6</result>