A right triangle, the three sides are 5 cm, 4 cm, 3 cm, what is its area?
一个直角三角形，三条边分别是5厘米、4厘米、3厘米，它的面积是多少．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<result>6</result>