A cylinder with a height of 30 cm and a base of a sector with a radius of 10 cm and a center of 270°. Find the surface area of this cylinder.
一个柱体，高30厘米，底面是一个半径10厘米，圆心为270°的扇形．求这个柱体的表面积．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 100 * 2 * (3/4)</gadget>
<output>471</output>

<gadget id="calculator">3.14 * 10 * 2 * (3/4)</gadget>
<output>47.1</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">47.1 + 20</gadget>
<output>67.1</output>

<gadget id="calculator">67.1 * 30</gadget>
<output>2_013</output>

<gadget id="calculator">471 + 2_013</gadget>
<output>2_484</output>

<result>2_484</result>