The two right-angled sides of the small red flag in a right triangle are 12 cm and 20 cm respectively. What is the area of this small red flag in square centimeters?
直角三角形小红旗的两条直角边分别是12厘米和20厘米，这面小红旗的面积是多少平方厘米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">12 * 10</gadget>
<output>120</output>

<result>120</result>