A cylindrical grain hoard, the diameter of the base measured from the inside is 6 meters, and it is filled with wheat 3 meters high. If each cubic meter of wheat weighs 0.7 tons, how many tons of wheat are there in this grain store? (Estimate the number first, then calculate)
一个圆柱形的粮囤，从里面量得底面直径是6米，装有3米的高的小麦．如果每立方米小麦重0.7吨，这个粮囤有小麦多少吨？(先估计得数，再计算)
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">0.7 * 3.14 * 9 * 3</gadget>
<output>59.346</output>

<result>59.346</result>