Lesson Notes By Weeks and Term v4 - SHS 1
MEASUREMENT
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MEASUREMENT
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Subject: Mathematics
Class: SHS 1
Term: 2nd Term
Week: 9
Grade code: 1.3.2.LI.4
Strand code: 3
Sub-strand code: 2
Content standard code: 1.3.2.CS.3
Indicator code: 1.3.2.LI.4
Theme: GEOMETRY AROUND US
Subtheme: MEASUREMENT
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This lesson introduces the concept of volume, specifically focusing on prisms. Volume is a measure of the three-dimensional space an object occupies. Understanding volume is crucial in our daily lives in Ghana, from knowing how much water a "polytank" can hold, to calculating the amount of concrete needed for a building project, to understanding the capacity of the packaging for products we buy and sell. We will learn a single, powerful formula that can be adapted to find the volume of many different types of prisms we see around us every day.
A. What is a Prism?
A prism is a three-dimensional (3D) solid object with two identical ends (called bases) that are parallel to each other. The sides are flat faces. The key feature of a prism is its uniform cross-section. This means that if you slice the prism anywhere along its length, the shape of the slice will be identical to its base. Analogy 1: Think of a loaf of sugar bread. Every slice you cut has the same rectangular shape. The loaf is a rectangular prism (a cuboid). Analogy 2: Think of a stack of 1 Cedi coins. The entire stack is a prism. The base is the circular coin, making it a cylinder (a type of circular prism).
The height (or length) of the prism is the perpendicular distance between its two bases. B. The General Formula for the Volume of a Prism
The volume of *any* prism can be found using one simple, powerful formula: