The circumference of a cylindrical base is 18.84 centimeters and the height is 4 decimeters. What is its surface area in square centimetres?
一个圆柱底面周长是18.84厘米，高4分米，它的表面积是多少平方厘米．
<gadget id="calculator">18.84 * 4 * 10</gadget>
<output>753.6</output>

<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<gadget id="calculator">753.6 + 56.52</gadget>
<output>810.12</output>

<result>810.12</result>