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Formula for Volume of a Cuboid

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Learning text on the topic Formula for Volume of a Cuboid

Understanding the Volume of a Cuboid

In our daily lives, we often come across objects shaped like cuboids (or rectangular prisms) - think of boxes, bricks or even parts of buildings. A prism is defined as a 3D shape with a constant cross section. A rectangular prism is a 3D shape with six faces, each one a rectangle. When we talk about the volume of a rectangular prism using cubic units, we find out how much space it takes up. It's like figuring out how much water can fill a fish tank or how many books you can pack into a box. This volume helps us understand the capacity of these objects in cubic units, which measure space in three dimensions.

Volume Formula: The volume of a rectangular prism is calculated by multiplying its length ($l$), width ($w$) and height ($h$). The formula is $V = l \times w \times h$.

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Formula for Volume of a Rectangular Prism

In maths, we often have more than one way to solve a problem, and that's true for finding the volume of a rectangular prism too.

The formula $V = l \times w \times h$ directly multiplies the prism's dimensions. This method is straightforward and effective for calculating volume.

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Let’s learn how to find the volume of a cuboid with this formula.

A cuboid has a length of $4$ cm, width of $3$ cm and height of $6$ cm. Calculate its volume.

  • Length ($l$) = $4$ cm
  • Width ($w$) = $3$ cm
  • Height ($h$) = $6$ cm
  • Volume = $l \times w \times h = 4 \times 3 \times 6 = 72$ cm$^3$

The volume of this cuboid is $72$ cubic centimetres.

We use cubic units for units of volume because volume measures three-dimensional space. Think of stacking little blocks inside a box - you're filling it lengthwise, widthwise and heightwise. So, we multiply these three dimensions, and the result is in cubic units, like filling a box with tiny cubes.

Find the volume of a cuboid with a length of 5 m, a width of 2 m and a height of 3 m.

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  • Length ($l$) = $5$ m
  • Width ($w$) = $2$ m
  • Height ($h$) = $3$ m
  • Volume = $l \times w \times h = 5 \times 2 \times 3 = 30$ m$^3$

The volume of this cuboid is $30$ cubic metres.

Use the formula for the volume of a cuboid, and solve these examples on your own!

Calculate the volume of a cuboid with a length of 10 inches, a width of 4 inches and a height of 6 inches.

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Determine the volume of the cuboid pictured above.

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Find the volume of a cuboid pictured above.
What is the volume of a rectangular storage container that is 6 metres long, 3 metres wide and 2.5 metres tall?

Finding the Volume of a Prism with $V=Bh$

Another formula to find the volume of a rectangular prism, or cuboid, is using $V = B \times h$. Here, $B$ represents the area of the base of the shape. For a rectangular prism, this base is the area of the rectangle at the bottom. This formula is really helpful, not just for rectangular prisms, but also for other 3D shapes like cylinders which have a circular base (volume of a cylinder). It helps us understand how much space these shapes occupy by considering their base area and height.

Let's calculate the volume of a cuboid with a length of 4 feet, a width of 3 feet and a height of 6 feet.

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Determine the dimensions of the cuboid:

  • Length ($l$) = $4$ ft
  • Width ($w$) = $3$ ft
  • Height ($h$) = $6$ ft

Calculate the base area (B):

  • The base area is found by multiplying the length and width.
  • Base Area ($B$) = $l \times w = 4 \times 3 = 12$ square feet.

Calculate the volume using $V = B \times h$:

  • Now, multiply the base area by the height.
  • Volume ($V$) = $B \times h = 12 \times 6 = 72$ cubic feet.

The volume of this cuboid is $72$ cubic feet.

Practise using this formula on your own!

A cuboid has dimensions of length 10 cm, width 5 cm and height 8 cm. Find its volume using the formula $V = B \times h$.

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Find the volume of a cuboid pictured above, using $V = B \times h$.
A cuboid has a length of 3 metres, a width of 2 metres and a height of 5 metres. Determine its volume with the formula $V = B \times h$.
Calculate the volume of a cuboid with dimensions of 12 ft (length), 7 ft (width) and 9 ft (height) using the formula $V = B \times h$.

Formula for Volume of a Cuboid – Application

Solving problems involving the volume of a cuboid, or rectangular prism, enhances our understanding of space and capacity. It applies in diverse fields, from architecture and construction to everyday tasks like packing or storage.

Find the volume of a box with a length of 8 cm, width of 7 cm and height of 10 cm.

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A rectangular garden bed measures 30 feet in length, 4 feet in width and 1.5 feet in depth. What is its volume in cubic feet?
Calculate the volume of a toy box with dimensions 24 inches in length, 18 inches in width and 15 inches in height using the formula V = Bh.

25847_tov-09.svg

A fish tank has dimensions of 75 cm in length, 30 cm in width and 40 cm in height. What is the volume of the tank in cubic centimetres?
Find the volume of a storage unit that is 2 yards long, 1 yard wide and 1.5 yards high using $V = Bh$.

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A rectangular prism-shaped shipping box has a height of $8$ inches and a volume of $1,536$ cubic inches. What is the area of the base, $B$ of the box?
A cereal box is in the shape of a rectangular prism with the following dimensions, height of $20$ cm, width of $50$ mm and a length of $10$ cm. What is the volume of the cereal box?

Formula for Volume of a Cuboid – Summary

Key Learnings from this Text:

  • Understanding the volume of a cuboid helps in calculating space in practical situations.
  • The volume formula, $V = l \times w \times h$, is straightforward and widely applicable.
  • Alternative method: $V = B \times h$, where $B$ is the base area, deepens conceptual understanding.
  • Real-world application of this knowledge spans from storage organisation to construction planning.
Formula Explanation
$V = l \times w \times h$ Multiply length ($l$), width ($w$) and height ($h$) to find the volume.
$V = B \times h$ Calculate the base area ($B$ = length x width), then multiply by height ($h$).

Formula for Volume of a Cuboid – Frequently Asked Questions

What is the formula to find the volume of a cuboid, or rectangular prism?
Can the volume of a cuboid (rectangular prism) be the same as a cube?
How do you find the volume of a cuboid with missing dimensions?
What does the formula $V = B \times h$ mean for a cuboid?
Is it possible to find the volume of a cuboid (rectangular prism) using only its length and width?
How do units affect the calculation of a cuboid's volume?
What's the difference between volume and surface area of a cuboid?
Can the formula for volume be used for all cuboids, regardless of size?
How does increasing one dimension of a cuboid affect its volume?
What is the significance of understanding the volume of a cuboid in real life?

Formula for Volume of a Cuboid exercise

Would you like to apply the knowledge you’ve learnt? You can review and practice it with the tasks for the learning text Formula for Volume of a Cuboid.
  • Find the volume of the cuboid.

    Hints

    To calculate the volume, multiply the length, width and height.

    We need to solve $10 \times 5 \times 5$.

    $5 \times 5 = 25$.

    Multiply this by $10$.

    Solution

    The volume of this cuboid is $250 cm^3$.

    The length is $10 cm$, the width is $5 cm$ and the height is $5 cm$.

    Multiply these together: $10 \times 5 \times 5 = 250$.

    Therefore, the correct answer is $250 cm^3$.

  • Calculate the volume.

    Hints

    The length is 4 cubes long.

    Count the cubes to find the width and height.

    Once you have the three measurements, multiply them together.

    Multiply $4 \times 2 \times 2$.

    Solution

    The length is 4 units, the width is 2 units and the height is 2 units.

    Multiply $4 \times 2 \times 2$ to get the volume, $16$ units $^3$.

  • Can you label the cuboid?

    Hints

    The height is the distance from the base to the top, the length is how long the cuboid is, and the width is perpendicular to the length.

    The formula to calculate the volume is $V= l \times w \times h$.

    Remember, volume is measured in cubic units such as $cm^3$.

    Once you have found the measurement of the total volume, work backwards to find the other measurements.

    Solution

    The length is $2 cm$, the width is $2 cm$ and the height is $10 cm$.

    When we multiply $10 \times 2 \times 2$, we get the total volume of the cuboid, $40 cm^3$.

  • Find all of the prisms with a volume of 48 centimetres cubed.

    Hints

    Find the volume using the formula $V= l \times w \times h$.

    There are three cuboids with a volume of $48 cm^3$.

    Solution

    These three cuboids have a volume of $48 cm^3$.

    • $2 \times 2 \times 12 = 48 cm^3$
    • $8 \times 2 \times 3 = 48 cm^3$
    • $4 \times 4 \times 3 = 48 cm^3$
    ____________________________________________________

    The volumes of the other two cuboids are:

    • $10 \times 3 \times 4 = 120 cm^3$
    • $3 \times 3 \times 6 = 54 cm^3$
  • Which are the formulas used to find the volume of a cuboid?

    Hints

    There are two formulas used to calculate the volume of a cuboid.

    One way to find the volume is to multiply the base times the height, where the base is the length times the width.

    Use this list to help you:

    • $V$ = volume
    • $A$ = area
    • $l$ = length
    • $w$ = width
    • $h$ = height
    • $b$ = base
    Solution

    To find the volume of a rectangular prism, use:

    • $V = b \times h$
    • $V = l \times w \times h$
    $V$ stands for volume, $b$ stands for base, $h$ stands for height, $l$ stands for length and $w$ stands for width.

  • Can you order the cuboids?

    Hints

    Use the formula $V= l \times w \times h$ to find the volume of each. Then sort from smallest to largest.

    Start by calculating the volume of the purple cuboid. Multiply $7 \times 7 \times 7$.

    These cuboids have measurements in inches, so the volume will be in inches cubed.

    Solution

    Use the formula $V= l \times w \times h$ to find the volume of each. Then sort from smallest to largest.

    • The volume of the red prism = $4 \times 6 \times 3 = 72 in^3$.
    • The volume of the blue prism = $5 \times 2 \times 8 =80 in^3$.
    • The volume of the orange prism = $2 \times 10 \times 5.5 =110 in^3$.
    • The volume of the purple prism = $7 \times 7 \times 7 =343 in^3$.

    So, the shapes from smallest to largest are red, blue, orange, purple.

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