Cuboid Dimension Challenge: Is Base Identification Necessary for 5x8x2 Surface Calculation?

Surface Area with Dimension Independence

Given an cuboid whose dimensions are 5,8,2

Indicate whether it is true or false:

To calculate the surface of the cuboid it is not necessary to know which are the sides of the base and which is the height.

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given an cuboid whose dimensions are 5,8,2

Indicate whether it is true or false:

To calculate the surface of the cuboid it is not necessary to know which are the sides of the base and which is the height.

2

Step-by-step solution

To solve this problem, we begin by calculating the surface area of the cuboid using its dimensions. The surface area formula for a cuboid is:

Surface Area=2(lw+lh+wh) \text{Surface Area} = 2(lw + lh + wh)

Substituting the dimensions 5, 8, and 2 into the formula, we calculate:

Surface Area=2((5×8)+(5×2)+(8×2)) \text{Surface Area} = 2((5 \times 8) + (5 \times 2) + (8 \times 2))

Surface Area=2(40+10+16) \text{Surface Area} = 2(40 + 10 + 16)

Surface Area=2(66) \text{Surface Area} = 2(66)

Surface Area=132 \text{Surface Area} = 132

Regardless of the assignment of dimensions as length, width, or height (due to the commutative nature of multiplication), the computed surface area remains the same at 132 square units.

Thus, it is indeed true that determining which dimensions are the base or height is unnecessary for calculating a cuboid's surface area. The computation yields consistent results irrespective of the assignment.

Therefore, the statement is true.

3

Final Answer

True

Key Points to Remember

Essential concepts to master this topic
  • Formula: Surface area uses SA = 2(lw + lh + wh)
  • Calculation: 2((5×8) + (5×2) + (8×2)) = 2(66) = 132
  • Verify: Try different dimension assignments - all give 132 square units ✓

Common Mistakes

Avoid these frequent errors
  • Thinking base identification affects surface area calculation
    Don't assume you need to identify which dimensions are length, width, or height = unnecessary confusion! The surface area formula treats all dimensions equally due to multiplication's commutative property. Always remember that SA = 2(lw + lh + wh) works regardless of dimension assignment.

Practice Quiz

Test your knowledge with interactive questions

Calculate the surface area of the orthohedron below using the data in the diagram.

333555222

FAQ

Everything you need to know about this question

Why doesn't it matter which dimension is the height?

+

The surface area formula SA=2(lw+lh+wh) SA = 2(lw + lh + wh) uses multiplication, and multiplication is commutative. Whether you call the dimensions 5×8×2 or 2×5×8, the products remain the same!

What if I want to find just the base area?

+

Then you would need to identify the base! But for total surface area, all six faces are included automatically in the formula, so dimension labels don't matter.

How can I double-check this with the 5×8×2 cuboid?

+

Try it! Assign dimensions differently:

  • Length=5, Width=8, Height=2: 2(40+10+16)=132 2(40+10+16) = 132
  • Length=8, Width=2, Height=5: 2(16+40+10)=132 2(16+40+10) = 132

Same result every time!

Does this rule apply to all 3D shapes?

+

No! This only works for rectangular prisms (cuboids) where opposite faces are identical. For shapes like cylinders or pyramids, orientation can matter for certain calculations.

What's the difference between surface area and volume?

+

Surface area measures the outside covering (like wrapping paper needed), while volume measures space inside. For volume, you multiply all three dimensions: V=l×w×h V = l \times w \times h .

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Cuboids questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations