If the three sides of a right triangle are 3cm, 4cm, and 5cm, what is the area in square centimeters?
一个直角三角形的三条边分别是3cm、4cm、5cm，那面积是多少平方厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>6</result>