A cylinder has a radius of 10 cm and a height of 9 cm, what is its surface area in cm**2.
一个圆柱的半径是10cm，高是9cm，它的表面积是多少cm**2．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 2</gadget>
<output>628</output>

<gadget id="calculator">2 * 3.14 * 10 * 9</gadget>
<output>565.2</output>

<gadget id="calculator">628 + 565.2</gadget>
<output>1_193.2</output>

<result>1_193.2</result>