Calculate Cuboid Volume: 4 Equal Orthohedra with AB=4 and BC=3/4AB

Volume Calculation with Composite Cuboids

Shown below is a large cuboid composed of 4 smaller orthohedra equal in size.

AB=4 AB=4

BC=34AB BC=\frac{3}{4}AB

BE=12AB BE=\frac{1}{2}AB

Calculate the volume of the large cuboid.

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Calculate the volume of the large box
00:03 BC size according to the data, substitute AB value and solve for BC
00:10 This is BC size
00:13 BE size according to the data, substitute AB value and solve for BE
00:17 This is BE size
00:22 The volume of the large box equals 4 volumes of small box
00:28 Let's use the formula for calculating box volume
00:31 width times height times length
00:35 Let's substitute appropriate values and solve for volume
00:43 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Shown below is a large cuboid composed of 4 smaller orthohedra equal in size.

AB=4 AB=4

BC=34AB BC=\frac{3}{4}AB

BE=12AB BE=\frac{1}{2}AB

Calculate the volume of the large cuboid.

AAABBBCCCKKKEEEDDD4

2

Step-by-step solution

To solve the problem, let's determine the dimensions of the large cuboid:

  • Step 1: Identify the given values: AB=4 AB = 4 , BC=34×AB BC = \frac{3}{4} \times AB , and BE=12×AB BE = \frac{1}{2} \times AB .
  • Step 2: Calculate the dimensions of the cuboid:
    • Since AB=4 AB = 4 , we find BC=34×4=3 BC = \frac{3}{4} \times 4 = 3 .
    • Next, BE=12×4=2 BE = \frac{1}{2} \times 4 = 2 .
  • Step 3: Calculate the volume of the large cuboid using the formula:
    • Volume=AB×BC×BE=4×3×2=24\text{Volume} = AB \times BC \times BE = 4 \times 3 \times 2 = 24.
    • Since the large cuboid is composed of four equal orthohedra, the volume of the entire large cuboid is 4×24=96cm3 4 \times 24 = 96 \, \text{cm}^3 .

So, the volume of the large cuboid is 96cm396 \, \text{cm}^3.

3

Final Answer

96 cm³

Key Points to Remember

Essential concepts to master this topic
  • Formula: Volume = length × width × height for cuboids
  • Technique: Calculate BC=34×4=3 BC = \frac{3}{4} \times 4 = 3 and BE=12×4=2 BE = \frac{1}{2} \times 4 = 2
  • Check: One orthohedron volume = 4 × 3 × 2 = 24, then multiply by 4 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to multiply by the number of smaller pieces
    Don't calculate just one orthohedron's volume (24) as the final answer! This ignores that the large cuboid contains 4 equal pieces. Always multiply the single piece volume by the total number of pieces: 24 × 4 = 96.

Practice Quiz

Test your knowledge with interactive questions

Calculate the volume of the rectangular prism below using the data provided.

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FAQ

Everything you need to know about this question

What's the difference between a cuboid and an orthohedron?

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They're actually the same thing! An orthohedron is just another name for a cuboid - both are 3D shapes with 6 rectangular faces and right angles everywhere.

Why do I need to calculate BC and BE separately?

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Because they're given as fractions of AB! You can't use the volume formula until you know all three actual dimensions: AB = 4, BC = 3, and BE = 2.

How do I know the large cuboid has 4 equal pieces?

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The problem states it directly: "a large cuboid composed of 4 smaller orthohedra equal in size." This means each piece has the same volume.

Can I solve this without finding individual dimensions?

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No - you must find the actual lengths first. The fractional relationships only make sense once you calculate the real measurements from the given information.

What if I get confused about which dimension is which?

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  • AB = 4 (given directly)
  • BC = 3 (calculated from 34×4 \frac{3}{4} \times 4 )
  • BE = 2 (calculated from 12×4 \frac{1}{2} \times 4 )

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