Traditional Concrete Masonry Unit (CMU) Blocks have 2 rectangular voids through the block. These voids are called "Cells". The face shell thickness is the thickness of the block material from the cell to the front of the block. For example, a typical block of dimensions 8"high by 8"deep by 16" long probably has a face shell thickness of 1.25".
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Measure the length and breadth of one face of the rectangle. Measure the thickness of the rectangle hollow piece. Multiply the length, breadth and thickness and this will give you the volume of the rectangular hollow piece in terms of cubic units. That is, if you measured the length, breadth and height in centimeters, the volume will be in cubic centimeters. Example: If the length of the piece is 10 cm, the breadth of the piece is 6 cm, and the thickness of the piece is 5 cm, the volume of the rectangular hollow piece is given by: 10 cm X 6 cm X 5 cm = 300 cubic cm or cm3
If these forms are all solid, a sphere has one side and face, a cone two, and a cylinder three. If there are hollow, they have one more face than side.
You can get a stack of pennies, measure the height of the stack and then divide by the number of pennies. You can also get the thickness by treating the penny as a cylinder, calculating the area of the face of the penny, then putting a whole lot of them in water, measuring the change of volume to get the total volume of all pennies, then divide by the number of pennies and divide again by the area of the penny to get the thickness.
many mathematical answers to this question (see wikipedia) but in simplistic terms define cylinder. if the edge of each surface defines a 'Face' the standard answer as used in such quizz games as "Are You Smarter Than a 10 Year Old" would be 3, but if we take the description to apply to a hollow sphere the answer would be 6, there being inside faces as well as outside. Haven't yet found this answer anywhere yet. But a cylinder has got 3 faces. The idea of the hollow sphere does not lead to 6 surfaces as 2 of them are the same in the cases of inside and outside, i.e. the end edges, so 4 would be the correct answer for a hollow sphere.
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