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: 7
Grade code: 1.3.2.LI.3
Strand code: 3
Sub-strand code: 2
Content standard code: 1.3.2.CS.3
Indicator code: 1.3.2.LI.3
Theme: GEOMETRY AROUND US
Subtheme: MEASUREMENT
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Measurement is a fundamental part of our daily lives here in Ghana. Whether we are helping a carpenter to tile a room, assisting a farmer to determine the size of a plot of land for planting maize, or helping a tailor cut fabric for a beautiful Kente or smock design, we use the concepts of perimeter and area. Today, we are moving beyond simple squares and rectangles to understand how to measure more complex shapes that we see all around us, like the shape of a kite our younger siblings fly, the design on a tiled floor, or the shape of a piece of land by the roadside.
This is the main content delivery part of the lesson. The teacher will use a mix of direct instruction, diagrams, and interactive questioning (Think-Pair-Share). A. Recap: Perimeter and Area Perimeter: The total distance around the *outside* of a 2-D shape. It is a measure of length. We find it by adding up the lengths of all the sides. Units: cm, m, km. Area: The amount of space or surface *inside* a 2-D shape. We find it using specific formulas. Units: cm², m², km². B. The Parallelogram Definition: A quadrilateral (a four-sided shape) where opposite sides are parallel and equal in length. Diagram: ```
/_______/ / /| / / | h (height) /_______/ b ``` Perimeter: Since opposite sides are equal, let the adjacent sides be 'a' and 'b'. Perimeter (P) = a + b + a + b = 2(a + b) Area: The area is NOT the base times the slanted side. It is the base times the perpendicular height. Imagine cutting off the triangle on one side and moving it to the other to form a rectangle. Area (A) = base × perpendicular height = b × h