Lesson Plan for Senior Secondary 1 - Technical Drawing - Enlargement And Reduction Of Plain Figures 2

# Lesson Plan for Technical Drawing: Enlargement and Reduction of Plain Figures ### Grade Level: Senior Secondary 1 ### Subject: Technical Drawing ### Duration: 90 minutes ### Topic: Enlargement and Reduction of Plain Figures --- ### Learning Objectives: 1. **Understand the concepts** of enlargement and reduction in technical drawing. 2. **Apply scale factors** to enlarge or reduce plain figures accurately. 3. **Develop skills** in using technical drawing tools effectively. 4. **Appreciate the practical applications** of enlargement and reduction in engineering and design. ### Materials Required: - Drawing paper - Technical drawing pencils (2H, H, HB) - Rulers - Compasses - Protractors - Set squares - Erasers - Scale rulers - Graph paper - Example plain figures (handouts) ### Key Vocabulary: - Scale Factor - Enlargement - Reduction - Plain Figures - Proportions ### Activities and Time Breakdown: #### Introduction (10 minutes) 1. **Welcome and Warm-Up:** - Greet the students and introduce the day’s topic. 2. **Review of Previous Lesson:** - Briefly discuss key points from the previous lesson on basic geometric drawing. 3. **Introduction to New Topic:** - Explain the concepts of enlargement and reduction. - Discuss real-life applications (e.g., architecture, engineering, and design). #### Direct Instruction (20 minutes) 1. **Demonstration:** - Use a plain figure (e.g., a square or triangle) and demonstrate how to enlarge and reduce it using a scale factor. - Show how to use the technical drawing tools for accuracy. 2. **Explain Scale Factors:** - Define scale factor and show mathematical calculations for enlarging and reducing figures (e.g., Multiplying by 2 for enlargement, 1/2 for reduction). 3. **Step-by-Step Guide:** - Provide a step-by-step process for applying scale factors to plain figures. #### Guided Practice (30 minutes) 1. **Enlargement Activity:** - Provide students with a simple plain figure and ask them to enlarge it by a scale factor of 2. - Circulate the classroom, provide support and feedback. 2. **Reduction Activity:** - Provide students with another plain figure and ask them to reduce it by a scale factor of 1/2. - Continue to offer guidance and check for understanding. #### Independent Practice (20 minutes) 1. **Individual Tasks:** - Assign each student a different plain figure on graph paper and ask them to choose a scale factor for enlargement and another for reduction. - Encourage students to apply the process independently. #### Review and Closing (10 minutes) 1. **Peer Review:** - Have students pair up and review each other’s drawings, providing constructive feedback. 2. **Q&A Session:** - Address any questions or concerns from students regarding the lesson. 3. **Homework Assignment:** - Assign a take-home task where students will draw a plain figure and enlarge and reduce it with different scale factors. 4. **Summary and Wrap-Up:** - Summarize the key points of the lesson. - Preview the next lesson topic. ### Assessment: - **Formative Assessment:** Monitor students’ progress during guided practice and provide immediate feedback. - **Summative Assessment:** Evaluate the accuracy of students' independent practice drawings and the take-home assignment. ### Differentiation: - **For Advanced Students:** Challenge them with more complex plain figures and different scale factors. - **For Struggling Students:** Provide additional one-on-one support and simpler figures initially. ### Reflection: - **Teacher’s Reflection:** - Reflect on the effectiveness of the lesson. - Note what went well and areas for improvement. - Consider student engagement and understanding for future planning. --- ### Standards Alignment: - **STEM/Technical Education Standards:** Ensure alignment with relevant curriculum standards for technical drawing and engineering. ### Notes: - Ensure all students have access to the necessary drawing tools. - Encourage a positive and supportive learning environment conducive to technical skill development. --- This lesson plan aims to build foundational skills in technical drawing focused on enlargement and reduction, fostering both practical proficiencies and theoretical understanding for Senior Secondary 1 students.