A cylindrical granary with a base diameter of 6 meters measured from the inside contains corn 2.5 meters high. If each cubic meter of corn weighs 0.8 tons, how many tons of corn does this granary hold?
一个圆柱形的粮仓，从里面量得底面直径是6米，装有2.5米高的玉米．如果每立方米玉米重0.8吨，这个粮仓装有多吨玉米？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">3.14 * 9 * 2.5</gadget>
<output>70.65</output>

<gadget id="calculator">0.8 * 70.65</gadget>
<output>56.52</output>

<result>56.52</result>