A bucket has a diameter of 25 cm and a height of 30 cm. After unfolding the sides, a parallelogram is obtained. What is the area of the parallelogram?
一个水桶，直径是25厘米，高是30厘米．侧面展开后得到一个平行四边形，这个平行四边形的面积是多少．
<gadget id="calculator">3.14 * 25 * 30</gadget>
<output>2_355</output>

<result>2_355</result>