A small right-angled triangle flag, one right-angled side is 15 cm long, and the other right-angled side is 24 cm long. To make 10 such small flags, how many square meters of red cloth should be used at least?
一种直角三角形的小旗，一条直角边长15厘米，另一条直角边长24厘米，做10面这样的小旗，至少要用红布多少平方米？
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">10 / 10_000</gadget>
<output>1/1_000 = around 0.001</output>

<gadget id="calculator">15 * 12 * (1/1_000)</gadget>
<output>9/50 = around 0.18</output>

<result>9/50 = around 0.18</result>