If a conical steel with a base radius of 3 decimeters and a height of 5 decimeters is forged into a cylinder with a height of 15 decimeters, what is the area of the bottom of the cylinder?
把一个底面半径是3分米，高5分米的圆锥形钢材锻造成一个高15分米的圆柱，这个圆柱的底面积是多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">5 / 15</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * (1/3)</gadget>
<output>3.14</output>

<result>3.14</result>