If the lengths of the two sides of a right triangle are 3 cm and 4 cm, what is the area of the right triangle in square centimeters?
直角三角形的两条直角边长分别为3厘米和4厘米，这个直角三角形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>