A cylindrical chimney has a base diameter of 20 cm and a height of 1 m. What is its surface area in square centimetres?
一个圆柱形烟囱，底面直径是20厘米，高是1米，它的表面积是多少平方厘米．
<gadget id="calculator">3.14 * 20 * 100</gadget>
<output>6_280</output>

<result>6_280</result>