# Area of Right – Angle Triangle

**SECOND TERM**

**WEEK 7**

**TOPIC: Area of Right – Angle Triangle **

**LEARNING AREA **

- Lesson One – Properties of Square and Rectangle
- Lesson Two – Cutting of Square and Rectangle
- Lesson Three – Area of Right – Angle Triangle
- Lesson Four – Revision/Test

**TIME** – 40 Minutes each.

**LEARNING OUTCOME **

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

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

**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.

**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**

- 9 – Years Basic Education Curriculum
- Lagos State Scheme of work
- New Method Mathematics Book 6
- All Relevant Materials
- Online Materials

**LESSON PLAN/DEVELOPMENT **

**ASEI LESSON PLANS ON RIGHT ANGLE TRIANGLES**

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