Calculate Cuboid Volume: 12cm Base Perimeter, 8cm Height Problem

Volume Calculation with Square Base Dimensions

Given an cuboid with a square base

Given that the perimeter of the base is 12 cm

Its height is equal to 8 cm

Is it possible to calculate the volume of the 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 box if possible
00:03 Square base according to the data, therefore equal sides
00:10 The perimeter of the square equals the sum of its sides
00:14 Let's substitute appropriate values and solve for side A
00:17 This is side A
00:22 Let's draw the box
00:29 Let's use the formula for calculating box volume
00:33 Height times length times width
00:38 Let's substitute appropriate values and solve for the 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

Given an cuboid with a square base

Given that the perimeter of the base is 12 cm

Its height is equal to 8 cm

Is it possible to calculate the volume of the cuboid?

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Calculate the side length of the square base.
  • Step 2: Calculate the area of the square base.
  • Step 3: Compute the volume of the cuboid using the area and height.

Let's work through each step:

Step 1: The perimeter of the square base is given as 12 cm. We can find the side length s s of the square using the perimeter formula:

P=4s P = 4s

So,

12=4s 12 = 4s which implies s=124=3 cm s = \frac{12}{4} = 3 \text{ cm} .

Step 2: The area of the square base is then:

Area=s2=32=9 cm2 \text{Area} = s^2 = 3^2 = 9 \text{ cm}^2 .

Step 3: To find the volume of the cuboid, we use the formula for volume:

V=Base Area×Height=9×8=72 cm3 V = \text{Base Area} \times \text{Height} = 9 \times 8 = 72 \text{ cm}^3 .

Thus, we have successfully determined that it is possible to calculate the volume of the cuboid, and the volume is 72 cm3 72 \text{ cm}^3 .

Therefore, the correct answer to the problem is Yes.

3

Final Answer

Yes

Key Points to Remember

Essential concepts to master this topic
  • Perimeter Formula: Use P = 4s to find side length from perimeter
  • Technique: Calculate 12 ÷ 4 = 3 cm side, then 3² = 9 cm² area
  • Check: Volume = base area × height: 9 × 8 = 72 cm³ ✓

Common Mistakes

Avoid these frequent errors
  • Confusing perimeter with area when calculating volume
    Don't use perimeter (12 cm) directly as the base area = wrong volume of 96 cm³! Perimeter tells you the distance around the base, not the space inside it. Always find the side length first, then square it for area.

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

Why can't I just use the perimeter as the base area?

+

Perimeter and area are completely different! Perimeter measures the distance around the square (12 cm), while area measures the space inside the square (9 cm²). You need area to calculate volume.

What if the base wasn't a square?

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If the base were a rectangle, you'd need both length and width to find the area. With just the perimeter, you couldn't determine the unique dimensions of a rectangle.

How do I remember the volume formula?

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Think of volume as layers of the base stacked up. Each layer has the area of the base, and you stack them up to the height: V=Base Area×Height V = \text{Base Area} \times \text{Height}

Is 72 cm³ a reasonable answer for this size?

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Always check if your answer makes sense! A 3×3×8 cm box should hold about 72 small cubes (1 cm each), which sounds reasonable for this size.

What units should my final answer have?

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Volume is always in cubic units. Since all measurements were in centimeters, the volume must be in cm³ (cubic centimeters).

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