Lesson Notes By Weeks and Term - Junior Secondary 2

Triangles

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TERM – 1ST TERM

WEEK EIGHT

Class: Junior Secondary School 2

Age: 13 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic:  TRIANGLES

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

  1. Define a triangle
  2. Identify types of triangles
  3. Sketch Types of Triangle and Parts of a Triangle

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,

demonstration, videos from source

INSTRUCTIONAL MATERIALS:   Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher describes a triangle and identify the parts of a triangle

Students pay

attention

STEP 2

EXPLANATION

Teacher state and discuss the types of triangles

Students pay

attention and

participate

STEP 3

DEMONSTRATION

Teacher guide students to sketch the types of triangles mentioned earlier

Students pay

attention and

participate

STEP 4

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

TRIANGLES

A triangle is a geometric shape with three sides, three vertices, and three angles. The sum of the interior angles of a triangle always equals 180 degrees. Triangles can be classified based on their side lengths and angle measures into various types, such as equilateral, isosceles, and scalene triangles.

Parts of a triangle

A triangle has three main parts: vertices (corners), sides, and angles. The vertices are the points where the sides meet, and the sides are the line segments connecting the vertices. The angles are formed by the intersection of two sides.

Types of triangle

Based on their side lengths, triangles can be classified as follows:

1. Equilateral Triangle: An equilateral triangle is a triangle in which all three sides are of equal length, and consequently, all three angles are of equal measure, each measuring 60 degrees.

2. Isosceles Triangle: An isosceles triangle is a triangle that has at least two sides of equal length. Consequently, the angles opposite those equal sides are also equal.

3. Scalene Triangle: A scalene triangle is a triangle in which all three sides have different lengths. Additionally, the angles in a scalene triangle can have different measures.

4. Right angle Triangle: A right-angled triangle is a triangle that has one angle measuring exactly 90 degrees. The side opposite the right angle is called the hypotenuse, and the other two sides are the legs of the triangle.

 

EVALUATION: 1. What is a triangle?

  1. Identify and sketch the types of triangles you know.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively