1-meter bamboo pole was erected next to the school flag, and its shadow length was measured to be 0.5 meters. At the same time, the shadow length of the flagpole was measured to be 9 meters. What is the height of the flagpole in meters?
在校旗旁边立了一根1米的竹竿，测得它的影长是0.5米，同时量出旗杆的影长是9米，旗杆的高度是多少米？
<gadget id="calculator">1 / 0.5</gadget>
<output>2</output>

<gadget id="calculator">2 * 9</gadget>
<output>18</output>

<result>18</result>