Fangfang bought a cylindrical pen container with a bottom diameter of 12 cm and a height of 15 cm. He wants to paste colored paper on the side and bottom of the pen container. How many square centimeters of colored paper do he need at least?
芳芳买了一个圆柱形的笔筒，底面直径为12厘米，高为15厘米，他想给笔筒的侧面和底面贴上彩纸，至少需要用多少平方厘米的彩纸？
<gadget id="calculator">3.14 * 12 * 15</gadget>
<output>565.2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<gadget id="calculator">565.2 + 113.04</gadget>
<output>678.24</output>

<result>678.24</result>