A small right-angled triangle flag made of paper, the two right-angled sides are 12 cm and 20 cm long. How many square centimeters are needed to make 10 small flags like this?
一面用纸做成的直角三角形小旗，两条直角边分别长12厘米和20厘米．做10面这样的小旗，至少需要多少平方厘米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">12 * 10 * 10</gadget>
<output>1_200</output>

<result>1_200</result>