A cylindrical lantern has a base diameter of 24 cm and a height of 30 cm. Paste colored paper on the bottom and sides of the lantern, at least how many square centimeters of colored paper is needed?
一个圆柱形的灯笼，底面直径是24厘米，高是30厘米．在灯笼的下底和侧面糊上彩纸，至少要多少平方厘米的彩纸？
<gadget id="calculator">3.14 * 24 * 30</gadget>
<output>2_260.8</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 ** 2</gadget>
<output>144</output>

<gadget id="calculator">3.14 * 144</gadget>
<output>452.16</output>

<gadget id="calculator">2_260.8 + 452.16</gadget>
<output>2_712.96</output>

<result>2_712.96</result>