The side lengths of an isosceles right triangle are 3 cm, 3 cm, and 5 cm respectively. What is the area of this triangle?
等腰直角三角形的边长分别是3厘米、3厘米、5厘米，这个三角形的面积是多少．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3 * (3/2)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>