TERM – 2^{ND} TERM
WEEK THREE
Class: Senior Secondary School 1
Age: 15 years
Duration: 40 minutes of 5 periods each
Date:
Subject: Technical Drawing
Topic: POLYGONS
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
I.) Define a polygon
II.) Identify and draw out the types of a polygon
III.) Construct a regular hexagon given the length of the sides
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 polygon and identify common types of polygons |
Students listens attentively to the teacher |
STEP 2 EXPLANATION |
Teacher constructs a regular hexagon given the length of the sides and also guide students to do the same. |
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
POLYGONS
A polygon is a two-dimensional geometric shape with straight sides. It's formed by connecting points in space. The sides do not intersect, and the angles between adjacent sides sum up to 180 degrees. Polygons can have various numbers of sides, ranging from three to infinity.
Types of polygons
The following are some common types of polygons:
1. Triangle: A polygon with three sides. Triangles can be further classified based on the length of their sides and the size of their angles, such as equilateral, isosceles, scalene, acute, obtuse, or right triangle.
2. Quadrilateral: A polygon with four sides. Examples include squares, rectangles, parallelograms, rhombuses, trapezoids, and kites. Quadrilaterals can be classified based on their properties, such as the lengths of their sides and the sizes of their angles.
3. Pentagon: A polygon with five sides. One example is a regular pentagon, where all sides and angles are equal.
4. Hexagon: A polygon with six sides. Similar to the pentagon, a regular hexagon has all sides and angles equal.
5. Heptagon (or septagon): A polygon with seven sides.
6. Octagon: A polygon with eight sides.
7. Nonagon (or enneagon): A polygon with nine sides.
8. Decagon: A polygon with ten sides.
How to construct a regular hexagon given the length of the sides
Constructing a regular hexagon using a compass is quite straightforward.
EVALUATION: 1. Using the procedure above, construct a regular heptagon of length 5 cm
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively