There is a cylindrical birthday cake with a radius of 10 cm and a height of 10 cm. Cream is spread all around and on top of it. Do you know the area of the creamed part?
有一个半径是10厘米，高10厘米的圆柱形生日蛋糕，在它的周围和上面涂满了奶油，你知道涂奶油部分的面积是多少吗？
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">2 * 3.14 * 10 * 10</gadget>
<output>628</output>

<gadget id="calculator">314 + 628</gadget>
<output>942</output>

<result>942</result>