# Lesson Notes By Weeks and Term - Senior Secondary 1

Types of lines and their uses

TERM – 1ST TERM

WEEK FOUR

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Technical Drawing

Topic: TYPES OF LINES AND THEIR USES

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

I.) Define a line.

II.) Identify the types of lines

III.) Describe the use of each line mentioned.

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 explains the meaning of lines and their respective uses. Students listens attentively to the teacher STEP 2 EXPLANATION Teacher identify the various types of lines and sketch them out.à Students exhibit attentiveness and active engagement STEP 3 NOTE TAKING The teacher writes a summarized note on the board The students copy the note in their books

NOTE

TYPES OF LINES AND THEIR USES

A line is a one-dimensional figure, which has length but no width. A line is made of a set of points which is extended in opposite directions infinitely. Lines can vary in length, width, direction, and curvature, and they can convey different moods and meanings depending on how they are used. It can either be straight or curved.

Types And Uses Of Lines:

1. Thick Continuous Line: This type of line is the most prominent in technical drawings, serving to delineate visible outlines, edges, and margins on the drawing paper. It is ideally rendered with a well-sharpened HB or 2H pencil.

2. Thin Continuous Line: Utilized for construction, dimensioning, projections, extensions, and hatching, this line type is crucial for various technical purposes. It is best achieved using 3H, 4H, or harder pencils.

3. Thick Long Chain Lines: These lines, characterized by their thickness and length, are employed to indicate viewing and cutting planes within drawings.

4. Thin Long Chain Lines: Used for center lines, path delineations, pitch circles, and the extreme positions of movable components, these lines also find application in indicating cutting and viewing planes.

5. Thin Continuous Lines with Arrowheads: Employed primarily for dimensions or to highlight labeled parts within the drawing.

6. Thin Short Dashes: These short, intermittent lines serve to represent hidden details, edges, or borders within the drawing.

7. Thin Continuous Irregular/Wavy Lines: Utilized to demarcate the limits of partial views or sections, particularly when the line does not represent an axis.

8. Thick Continuous Irregular/Wavy Lines: Serving to outline irregular boundaries or short breaks within the drawing.

9. Thin Ruled Lines with Short Zig-Zags: These lines are utilized to denote long breaks within the drawing's structure.

EVALUATION: 1. What is a line.

1. Identify the types of lines you know and sketch them out.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively