A small right-angled triangle flag made of paper, with a base of 12 cm and a height of 20 cm. How many square centimeters of paper is needed to make 10 such small flags?
一面用纸做成的直角三角形小旗子，底是12厘米，高是20厘米．做10面这样的小旗子，至少需要多少平方厘米纸？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<result>1_200</result>