By the end of the lesson, the pupils should be able to:
Reviewing work done on perimeters of plane shapes.
Identifying rectangles that have same area but different perimeters.
Finding the perimeters of compound shapes.
Perimeter is a distance round a shape. Perimeter means the sum of lengths of all the sides of a plane shape – triangles, other quadrilaterals and higher polygons = sum of lengths of all sides. It can be used to calculate the length of fence surrounding a building or garden. Two shapes may have the same perimeter, but different areas or may have the same area, but different perimeters.
The concept of perimeter will enable pupils to understand the different between areas and perimeter and appreciate the use of perimeter within and around us.
Ruler and measuring tape
Box – square and rectangular faces
Chart of triangle, square and rectangle
Improvises measuring materials like hands, legs, or any length wood or rod.
Groups the pupils into four groups – A, B, C, and D.
Guide the pupils to choose a leader and secretary for your group.
Gives each group learning materials – measuring tape.
Belong to a group.
Choose their leader and secretary.
Received learning materials for their group.
LEARNING POINT – Pupil’s group, leader and secretary confirmed.
Step 3 -Development – (10 minutes)
Takes pupils out to the field and guides them to measure the lengths of the field.
Names each length according to their group – length A, B C and D.
Measure the lengths of the School’s field.
Length A –
Length B –
Length C –
Length D –
LEARNING POINT – Length
Step 4 -Development – (10 minutes)
Guides the pupils to add –
Length (A + B), named it AB
Length (C + D), named it CD
Length (AB + CD), named it perimeter.
Length AB = ____ cm
Length CD = ____ cm
Perimeter = ____ cm
LEARNING POINT – Introduction to perimeter
Step 5 – CONCLUSION (10 minutes)
To conclude the lesson for the week, the teacher revises (through questions and answers) the entire lesson and links it to the next lesson. When you add together all the lengths of a shape, you are calculating its perimeter.
Listen, ask and answer questions.
Perimeter means the sum of lengths all the sides of a plane shape.
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