# Lesson Notes By Weeks and Term - Junior Secondary 3

Drawing practices (pictorial drawing) - Isometric drawing

TERM – 3RD TERM

WEEK SEVEN

Class: Junior Secondary School 3

Age: 14 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic:  DRAWING PRACTICES (PICTORIAL DRAWING) –ISOMETRIC DRAWING

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

1. Define isometric
2. Construct simple objects in isometric view

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,

demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures, mathematical sets, drawing instruments

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

 PRESENTATION TEACHER’S ACTIVITY STUDENT’S ACTIVITY STEP 1 INTRODUCTION The teacher explains the meaning of isometric projection. Students pay attention STEP 2 EXPLANATION Teacher discusses the procedure for carrying out isometric drawing Students pay attention and participate STEP 3 DEMONSTRATION Teacher guide students to construct simple objects in isometric view 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

DRAWING PRACTICES (PICTORIAL DRAWING) –ISOMETRIC DRAWING

Isometric drawing is a 3D representation of an object where all three dimensions are shown at the same scale. Drawing an isometric sketch is created using three axes. One axis is vertical, and the other two are connected horizontally to the vertical axis. The horizontal axes are created using 30-degree angles.

Procedure for the construction of of isometric Projection

1. Draw with set squares, place the set square and makes sure that both the face and the side are inclined at 30⁰ to the horizontal plane.
2. Draw the isometric box that contains the object first. The box should have the overall size of the length , breadth and width of the desired shape.
3. Draw the desired shape with faint lines inside the box using the correct dimensions.
4. Draw the correct shape of the object with a thick continuous line
5. Erase out the construction lines neatly

Examples of isometric drawing

EVALUATION: 1. What is isometric drawing?

1. Identify the procedure for constructing a simple isometric drawing

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively