To make a pair of cylindrical tin buckets without a cover, the circumference of the bottom surface is 9.42dm, and the height is 4.5dm. How many square decimeters of tin should be at least?
做一对无盖圆柱铁皮水桶，底面周长9.42dm，高是4.5dm，至少要铁皮多少平方分米？
<gadget id="calculator">9.42 / 3.14 / 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">3.14 * 2.25</gadget>
<output>7.065</output>

<gadget id="calculator">9.42 * 4.5</gadget>
<output>42.39</output>

<gadget id="calculator">7.065 + 42.39</gadget>
<output>49.455</output>

<gadget id="calculator">49.455 * 2</gadget>
<output>98.91</output>

<result>98.91</result>