A circular children's swimming pool, measured from the inside, has a bottom area of 12.56m**2 and a height of 13dm. The inner and bottom surfaces of this children's swimming pool are made of acrylic. How much acrylic is used for this swimming pool?
一个圆形儿童游泳池，从里面量，底面积是12.56m**2，高是13dm，这个儿童泳池的内侧和底面用的材料是亚克力，这个泳池用了多大面积的亚克力？
<gadget id="calculator">2 * 3.14 * 2 * 1.3</gadget>
<output>16.328</output>

<gadget id="calculator">16.328 + 12.56</gadget>
<output>28.888</output>

<result>28.888</result>