Area of Right – Angle Triangle

Last Updated on July 15, 2020 by Alabi M. S.

MATHEMATICS 

SECOND TERM

WEEK 7

PRIMARY 5

TOPIC: Area of Right – Angle Triangle 

[mediator_tech]

LEARNING AREA 

  1. Lesson One – Properties of Square and Rectangle
  2. Lesson Two – Cutting of Square and Rectangle
  3. Lesson Three – Area of Right – Angle Triangle
  4. Lesson Four – Revision/Test

TIME – 40 Minutes each.

LEARNING OUTCOME 

By the end of the lesson, pupils should be able to –

  1. find the area of squares and rectangles (revision).
  2. find the area of a right – angled triangle.
  3. solve word problems involving area.

[mediator_tech]

RATIONALE

Triangle is 3 sided shape. There are 4 major types of triangle – Equilateral, isosceles, scalene and right – angle triangle. Right – angle triangle is a triangle with one of its angles equal to 90°. Area of a shape is the amount of space covered. The area of right – angle triangle is equal to the area of square or rectangle divided by 2. That’s 1/2 base x height. In this lesson, the pupils will be to understand and appreciate the concept of area of triangle by dividing the square or rectangle through the diagonal.

[mediator_tech]

LEARNING MATERIALS 

The teacher will teach the lesson with the aid of cardboard, scissors, rulers and pencils.

PREVIOUS KNOWLEDGE

The pupils understand different types of triangle as 3 sided shapes.

REFERENCE MATERIALS

  1. 9 – Years Basic Education Curriculum
  2. Lagos State Scheme of work
  3. New Method Mathematics Book 6
  4. All Relevant Materials
  5. Online Materials

[mediator_tech]

LESSON PLAN/DEVELOPMENT 

ASEI LESSON PLANS ON RIGHT ANGLE TRIANGLES

  1. LESSON DEVELOPMENT 1 – AREA AND PROPERTIES OF RECTANGLE AND SQUARE doc
  2. LESSON DEVELOPMENT 2 – CUTTING OF SQUARE AND RECTANGLE doc
  3. LESSON DEVELOPMENT 3 – AREA OF RIGHT – ANGLE TRIANGLE doc
  4. LESSON DEVELOPMENT 4 – Revision/Test