A cylindrical pencil without an eraser tip is 20 cm long and has a base radius of 0.5 cm. What is the area of the painted part of this pencil?
一支没有橡皮头的圆柱形铅笔长20厘米，底面半径0.5厘米．这支铅笔有油漆部分的面积是多少？
<gadget id="calculator">2 * 3.14 * 0.5 * 20</gadget>
<output>62.8</output>

<result>62.8</result>