圆锥与圆柱等底，它们的底面圆的半径相等，等于6.28÷2÷3.14=1米圆锥的体积是1/3×3.14×1²×0.3=0.314立方米圆柱的体积是3.14×1²×2=6.28立方米0.314+6.28=6.594立方米650×6.594=4286.1千克答：这囤稻谷重4286.1千克
