If the two sides of a right triangle are 8 cm and 9 cm respectively, what is its area in square centimeters?
一个直角三角形的两条边分别是8厘米和9厘米，它的面积是多少平方厘米．
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">8 * (9/2)</gadget>
<output>36</output>

<result>36</result>