TERM – 2^{ND} TERM
WEEK SIX
Class: Senior Secondary School 1
Age: 15 years
Duration: 40 minutes of 5 periods each
Date:
Subject: Technical Drawing
Topic: ENLARGEMENT AND REDUCTION OF PLAIN FIGURES 1
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
I.) Differentiate between enlargement and reduction
II.) Describe the applications of enlargement and reduction
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 and identify enlargement and reduction ratios. |
Students listens attentively to the teacher |
STEP 2 EXPLANATION |
Teacher discusses the applications of enlargement and reduction. |
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
ENLARGEMENT AND REDUCTION OF PLAIN FIGURES 1
Enlargement of plane figures
Enlargement of plane figures involves increasing the size of a shape while maintaining its proportions. This means that all lengths, angles, and ratios within the figure are scaled up by the same factor, resulting in a larger version of the original shape. It's commonly done by multiplying the coordinates of each point in the figure by the scale factor.
Enlargement ratios can vary widely depending on the specific enlargement being performed. Common enlargement ratios include:
Reduction of plane figures
Reduction of plane figures involves decreasing the size of a shape while preserving its proportions. Like enlargement, all lengths, angles, and ratios within the figure are scaled down by the same factor, resulting in a smaller version of the original shape. This process is typically achieved by dividing the coordinates of each point in the figure by the scale factor.
Reduction ratios indicate how much smaller a figure becomes after reduction. Like enlargement ratios, they can be expressed as a fraction or a decimal. Below are some common reduction ratios:
Application of enlargement and reduction
Applications of enlargement and reduction of plane figures include:
EVALUATION: 1. What is difference between enlargement e reduction.
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively