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Building Blocks Use a decision algorithm to show that a rectangular solid with dimensions \(m \times n \times r\) can be constructed with \(m \cdot n \cdot r\) cubical \(1 \times 1 \times 1\) blocks. (See the figure.)

Short Answer

Expert verified
To construct a rectangular solid with dimensions \(m \times n \times r\), we can think of it as \(m\) layers stacked on top of each other where each layer has dimensions \(n\times r\). For each layer, we stack \(n\) blocks along the length and \(r\) blocks along the width, using \(n \cdot r\) blocks per layer. By stacking \(m\) layers, we create the original rectangular solid. In total, we used \(m \cdot n \cdot r\) cubical blocks of size \(1 \times 1 \times 1\).

Step by step solution

01

Understanding the dimensions of the rectangular solid

Given a rectangular solid with dimensions \(m\times n\times r\), we can think of it as \(m\) layers stacked on top of each other where each layer has dimensions \(n\times r\).
02

Divide the rectangular solid along the length

Now we need to show that we can construct each layer of dimensions \(n\times r\) using \(n \cdot r\) cubical blocks. We can do this by stacking \(n\) blocks along the length for each of the \(r\) length units.
03

Divide the rectangular solid along the width

Next, for each length unit, we can stack the \(r\) blocks horizontally along the width, filling up one layer with dimensions \(n \times r\). This will use \(n \cdot r\) blocks to fill the layer.
04

Stack the m layers

Finally, we can stack the \(m\) layers, each with dimensions \(n \times r\), on top of one another to create the original rectangular solid with dimensions \(m \times n \times r\).
05

Calculate the total number of blocks used

To see how many blocks were used in constructing the rectangular solid, we can multiply the number of blocks per layer (\(n \cdot r\)) by the total number of layers (\(m\)): \(m \cdot (n \cdot r) = m \cdot n \cdot r\). This confirms that we can construct a rectangular solid with dimensions \(m \times n \times r\) using \(m \cdot n \cdot r\) cubical blocks of size \(1 \times 1 \times 1\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Volume Calculation
To calculate the volume of a rectangular solid, you simply multiply its dimensions: length, width, and height. In mathematical terms, if a rectangular solid has dimensions of \(m \times n \times r\), the volume \(V\) is given by:
  • \(V = m \times n \times r\)
Understanding this formula is crucial because it tells us how much space the 3D shape occupies. In the context of building a solid with blocks, the volume also represents the total number of cubical blocks needed.
For example, if the dimensions were \(3 \times 4 \times 5\), the volume would be \(3 \times 4 \times 5 = 60\). This means you need 60 blocks to fill the solid entirely.
Cubical Blocks
Cubical blocks are 3D shapes where all sides are equal, often referred to as cubes. In this problem, each block is a \(1 \times 1 \times 1\) unit cube. This makes it particularly straightforward to visualize their use in constructing larger shapes, like a rectangular solid.
A rectangular solid can be visualized as a collection of these cubes, perfectly filling the shape without any gaps or overlaps. When referencing a block in this context, it signifies a single unit cube. By using these unit blocks, you can build more complex structures by arranging and stacking them accurately.
Understanding these basic units allows us to grasp how they fit together within the confines of a larger volume to construct the intended shape.
Layer Stacking
The method of layer stacking refers to the process of building a structure by arranging several identical layers on top of one another. In a rectangular solid with dimensions \(m \times n \times r\), consider each layer having dimensions \(n \times r\).
Here's how stack layers work:
  • Each layer is made up of \(n \cdot r\) cubical blocks.
  • These layers are stacked vertically to achieve the height of \(m\) units.
This approach ensures we fill the entire rectangular space methodically, confirming that each cubical block is perfectly placed. Thanks to this organized stacking, transferring theoretical calculations into a physical build becomes hassle-free. It should now be evident how multiplying layer counts by block count per layer results in the complete solid.
Algorithmic Problem Solving
Algorithmic problem solving is a systematic method to break down complex problems into manageable steps. For constructing a rectangular solid, it begins with a clear understanding of the required dimensions and ends with a complete solid.
This is accomplished through the following steps:
  • Conceptualize the larger solid as a series of smaller, identical, and easy-to-handle components 鈥 the unit cubical blocks.
  • Identify the total number of these units required using a mathematical formula.鈥
  • Visualize the stacking procedures layer-by-layer, ensuring precision in achieving the desired length, width, and height.
Algorithmic thinking simplifies complex constructions into highly predictable and repeatable actions. It underpins how we systematically convert measurements into accurate physical constructions using logical sequences.

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