Mathematics Grade 8 15 min

Volume of a cube

Volume of a cube

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1

Introduction & Learning Objectives

Learning Objectives Define a cube and identify its key dimensions. Explain the concept of volume as the amount of space a 3D object occupies. State the formula for calculating the volume of a cube. Calculate the volume of a cube given its edge length. Determine the edge length of a cube given its volume. Solve real-world problems involving the volume of a cube. Ever wondered how much water a perfectly square fish tank can hold? 🐠 Or how much space a Rubik's Cube takes up? 🤔 In this lesson, you'll learn all about the volume of a cube – a fundamental concept in geometry. Understanding volume helps us measure the capacity of many everyday objects and solve practical problems. Real-World Applications Calculating the capacity of storage boxes or containers. Det...
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Key Concepts & Vocabulary

TermDefinitionExample CubeA three-dimensional solid object bounded by six square faces, facets, or sides, with three meeting at each vertex. All its edges are equal in length.A standard dice or a Rubik's Cube. VolumeThe amount of three-dimensional space occupied by a solid object or enclosed within a container. It is measured in cubic units.The amount of water that fills a bottle, measured in liters or cubic centimeters. Edge (of a cube)A line segment where two faces of a cube meet. All edges of a cube have the same length.One of the 12 identical line segments forming the skeleton of a cube. Face (of a cube)A flat surface of a three-dimensional shape. A cube has six square faces.One of the six square sides of a cardboard box. Cubic UnitA unit of volume equal to the volume of a cube w...
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Core Formulas

Volume of a Cube Formula $V = s^3$ To find the volume ($V$) of a cube, multiply the length of its edge (or side, $s$) by itself three times. This is equivalent to cubing the edge length. Finding Edge Length from Volume $s = \sqrt[3]{V}$ To find the edge length ($s$) of a cube when its volume ($V$) is known, calculate the cube root of the volume. This is the inverse operation of cubing.

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Sample Practice Questions

Challenging
If the length of each edge of a cube is doubled, how many times larger does its volume become?
A.2 times larger
B.4 times larger
C.6 times larger
D.8 times larger
Challenging
A cube has 12 edges. If the sum of the lengths of all the edges of a cube is 60 cm, what is its volume?
A.25 cm³
B.125 cm³
C.150 cm³
D.216 cm³
Challenging
A special cube has a volume (in cubic units) that is numerically equal to its total surface area (in square units). What is the edge length of this cube?
A.1 unit
B.4 units
C.6 units
D.8 units

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