A cylindrical iron block with a base diameter of 8 cm and a height of 15 cm is melted and cast into a cylinder. The height of the cylinder is 5 cm. What is the area of its base in square centimeters?
把一个底面直径为8厘米，高15厘米的圆锥形铁块熔铸成一个圆柱体，圆柱体的高是5厘米，它的底面积是多少平方厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

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

<gadget id="calculator">(1/3) * 3.14 * 16 * 3</gadget>
<output>50.24</output>

<result>50.24</result>