A conical tin block with a base radius of 5 cm and a height of 9 cm is melted and cast into a cylinder. It is known that the height of the cylinder is 15 cm. What is the area of the base of the cylinder in square centimeters?
一个圆锥形锡块，底面半径5厘米，高9厘米，把它熔铸成一个圆柱体，已知圆柱体高15厘米，圆柱体的底面积是多少平方厘米？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) / 15</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">25 * 3.14 * 9 * (1/45)</gadget>
<output>15.7</output>

<result>15.7</result>