A cylinder is 15 cm high and has a base radius of 10 cm. What is its surface area?
一个圆柱高15cm，底面半径为10cm，它的表面积是多少？
<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 * 15</gadget>
<output>942</output>

<gadget id="calculator">628 + 942</gadget>
<output>1_570</output>

<result>1_570</result>