Lesson Notes By Weeks and Term v4 - SHS 1
MEASUREMENT
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
MEASUREMENT
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Mathematics
Class: SHS 1
Term: 2nd Term
Week: 6
Grade code: 1.3.2.LI.2
Strand code: 3
Sub-strand code: 2
Content standard code: 1.3.2.CS.3
Indicator code: 1.3.2.LI.2
Theme: GEOMETRY AROUND US
Subtheme: MEASUREMENT
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
Welcome, learners! Today, we are exploring a very practical part of mathematics called Measurement. Think about the world around you in Ghana. A farmer needs to know the size of their cocoa farm to buy the right amount of fertilizer. A tailor must measure fabric accurately to sew a beautiful Kente or smock. A carpenter building a roof needs to calculate the area to buy the correct number of roofing sheets. All these activities involve understanding the perimeter (the distance around a shape) and the area (the space a shape covers). In this lesson, we will learn how to find these measurements for different shapes, even those that are not perfect squares or circles.
A. Foundational Concepts: Perimeter and Area Perimeter: This is the total distance around the *outside* of a 2D shape. Imagine you are walking along the boundary of a school field; the total distance you walk is the perimeter. It is measured in linear units like centimetres (cm), metres (m), or kilometres (km). For most polygons, you find the perimeter by adding the lengths of all its sides. Area: This is the measure of the surface or space *inside* a 2D shape. Imagine you are painting a wall; the total surface you cover with paint is the area. It is measured in square units like square centimetres (cm²), square metres (m²), or hectares (ha). B. Area and Perimeter of Specific Quadrilaterals
In this section, we will learn the formulas for the specific shapes mentioned in the curriculum. i. Parallelogram A parallelogram is a four-sided shape where opposite sides are parallel and equal in length. Perimeter: `P = 2(a + b)`, where 'a' and 'b' are the lengths of adjacent sides. Area: `A = base × perpendicular height` or `A = b × h`. Important: The height 'h' must be perpendicular (at 90°) to the base 'b'. Do not use the slanted side length for 'a' in the area formula unless it is a rectangle.