You cannot. The lengths and widths are not sufficient information to determine the height.
rectangular prism is a 3D structure with 4 lengths 4 widths 4 heights
Since the question asks about the perimeter, lengths and widths, it is not clear what the 30 feet measure, which is given in the question, refers to! Without that information, it is impossible to answer the question.
You can't find the widths of a rectangle with the lengths because the widths can be anything lower than the lengths. Like if your rectangle had a length of 7 the width can be 6, 5, 4, 3, 2, and so on.
A cube with unequal sides does not exist, as a cube is defined as a three-dimensional shape with six equal square faces. If the sides are unequal, the shape is classified as a rectangular prism or a cuboid, which has rectangular faces and varying lengths, widths, and heights.
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Different pools have different proportions.
Batt insulation comes in a variety of widths, lengths and thicknesses.
Widths and lengths are two entirely different things. They don't go into anything other than Length x Width = Area.
Four - two lengths (sides) and two widths (ends).
A rectangle has 2 equal widths and 2 equal lengths whereas a rhombus has 4 equal widths but they are both 4 sided quadrilaterals.