For a solid with a stepped (staircase) profile symmetric about a vertical axis, the volume when completely filled can be found by summing the volumes of horizontal square 'slabs' at each step level — i.e. treating the shape as a stack of square prisms of decreasing side length.
The pond has a square outline. Starting from the outer rim (side = 10 m) and stepping inward by 0.5 m per side at each...
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