There is a cylindrical tin barrel (with a cover), whose bottom area is exactly equal to the side area. If the bottom area of the cylinder remains the same and the height increases by 3 cm, its surface area will increase by 565.2 square centimeters. The original surface area of the cylinder is How many? (take 3.14)
有一个圆柱体型铁皮桶(有盖)，它的底面积与侧面积正好相等，如果这个圆柱的底面积不变，高增加3厘米，它的表面积就增加565.2平方厘米，这个圆柱原来的表面积是多少？(取3.14)
<gadget id="calculator">565.2 / 3</gadget>
<output>188.4</output>

<gadget id="calculator">188.4 / 2 / 3.14</gadget>
<output>30</output>

<gadget id="calculator">30 ** 2</gadget>
<output>900</output>

<gadget id="calculator">3.14 * 900 * 3</gadget>
<output>8_478</output>

<result>8_478</result>