A right triangle, the lengths of the three sides are 3 meters, 4 meters, 5 meters respectively, what is the area of the triangle in square meters?
一个直角三角形，三条边的长度分别是3米、4米、5米，这个三角形的面积是多少平方米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>6</result>