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The bottom area of a cone-shaped sand beach is 3 m and H is 2 M. how high can this pile of sand be laid in a rectangular sand pit with an average length of 4 m and a width of 3 m?
The volume of sand pile is 12.56 × 0.9 × 1 / 3 = 3.768, the area of sand pit is 4.5 × 2 = 9, and the thickness of sand pit is 3.768 △ 9 = 0.42 (m)
The carriage of a truck is a cuboid, which is 4 meters long, 1.5 meters wide and 4 decimeters high, full of sand,
After unloading, pile up a cone-shaped sand pile with a height of 5 decimeters. How many square meters is the bottom area of the sand pile?
4 decimeters = 0.4 meters
The volume of sand is 4 × 1.5 × 0.4 = 2.4 cubic meters
5 decimeter = 0.5 meter
2.4×3÷0.5=14.4
A: the bottom area of this sand pile is 14.4 square meters
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