### Lesson Plan: Oblique Drawing
#### Subject: Technical Drawing
#### Level: Senior Secondary 1
#### Duration: 60 Minutes
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**Lesson Topic:** Oblique Drawing
#### Objectives:
By the end of the lesson, students will be able to:
1. Understand the basic principles of oblique drawing.
2. Identify the differences between oblique, isometric, and orthographic projections.
3. Draw simple objects using the oblique drawing method.
#### Materials Needed:
- Drawing boards
- T-squares
- Set squares
- Drawing pencils (HB, 2B)
- Erasers
- Rulers
- Drawing paper (A4 or A3 size)
- Examples of oblique drawings
#### Preparation:
- Prepare a few simple objects for students to draw (e.g., a book, a box, a can).
- Ensure all drawing tools are available and in good condition.
- Print handouts summarizing the key points of oblique drawing.
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### Lesson Plan Structure:
#### Introduction (10 minutes)
1. **Welcome and Objective:**
- Greet students and briefly state the objectives of the lesson.
- Explain the importance of oblique drawing in technical careers such as architecture, engineering, and product design.
2. **Review of Projection Types:**
- Quickly review other types of projections (orthographic and isometric) to set the context.
- Use diagrams to show the differences among the types.
#### Direct Instruction (20 minutes)
1. **Explanation of Oblique Drawing:**
- Define oblique drawing and explain its basic principles.
- Highlight that oblique drawing represents the front view of an object in its true shape and size, while the sides are drawn at an angle (typically 45° or 30°) and not to scale.
2. **Types of Oblique Drawings:**
- Cavalier Oblique: All dimensions are at full scale.
- Cabinet Oblique: Side dimensions are scaled down by half (usually more realistic).
- Use examples to illustrate both types.
3. **Drawing Angles:**
- Discuss common angles used (30°, 45°).
- Explain how to set these angles using a set square.
4. **Steps to Create an Oblique Drawing:**
- Draw the front face of the object to full scale.
- Project lines at the chosen angle from each corner of the front face.
- Mark the depths of the object along these lines (depending on the type of oblique projection).
- Complete the outlines of the object ensuring all projections and intersections are accurate.
#### Guided Practice (20 minutes)
1. **Drawing a Simple Object:**
- Demonstrate drawing a simple object (e.g., a box) step-by-step on the board, using the Cavalier method.
- Allow students to follow along step-by-step on their own drawing paper.
2. **Individual Practice:**
- Ask students to draw a different object using the Cabinet oblique method.
- Walk around to monitor progress and provide assistance as needed.
#### Assessment and Review (10 minutes)
1. **Peer Review:**
- Have students pair up and review each other's works to provide constructive feedback.
- Encourage students to discuss any difficulties encountered and how to resolve them.
2. **Class Review:**
- Select a few drawings to discuss as a class, highlighting common errors and best practices.
3. **Closing Questions:**
- Ask a few review questions to reinforce learning (e.g., What is the difference between Cavalier and Cabinet oblique drawings? Why are certain angles preferred?).
#### Homework/Extension:
- Assign students to draw an object of their choice using both the Cavalier and Cabinet methods.
- Encourage them to bring in the objects or photos of the objects they will draw as references for the next class.
#### Reflection:
- Reflect on the lesson's effectiveness. Were the objectives met? What went well? What could be improved for the next lesson?
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### Note:
Make sure to provide a supportive environment where students feel comfortable asking questions and making mistakes. Encourage creativity and precision in their technical drawings.