Construction and Sketches Mastering Angle Construction: Bisection and Precision Techniques Basic Technology JSS 2 First Term Lesson Notes Week 8
FIRST TERM
SCHEME OF WORK WITH LESSON NOTES
Subject :
BASIC TECHNOLOGY
Topic:
Definition and Types of Triangles
Term :
FIRST TERM
Week:
WEEK 8
Class :
JSS 2 (BASIC 8)
Basic Technology JSS 2 First Term Lesson Notes Week 8
Subject: Basic Technology
Class: JSS 2
Term: First Term
Week: 8
Age: 12 years
Topic: Angles II
Sub-topic: Bisection and Construction of Angles (90°, 45°, 60°, 30°, etc.)
Duration: 40 minutes
Behavioural Objectives:
By the end of the lesson, students should be able to:
- Understand the concept of angle bisection.
- Construct angles of 90°, 45°, 60°, and 30°.
- Apply these constructions in practical scenarios.
Keywords:
- Bisection: Dividing an angle into two equal parts.
- Construction: Creating angles using a compass and straightedge.
- Protractor: A tool for measuring angles.
- Vertex: The point where two lines meet.
- Ray: A line with a single endpoint extending infinitely in one direction.
Set Induction:
The teacher asks students to recall their previous lesson on angles and introduces the importance of constructing specific angles in geometry and design.
Entry Behaviour:
Students should have a basic understanding of angles and their types from previous lessons.
Learning Resources and Materials:
- Protractors
- Compasses
- Rulers
- Whiteboard and markers
- Visual aids showing angle constructions
Building Background/Connection to Prior Knowledge:
Students are familiar with measuring angles and the properties of different types of angles.
Embedded Core Skills:
- Practical skills in measurement and construction
- Problem-solving
- Critical thinking
Learning Materials:
- Angle construction charts
- Reference books on geometry and angles
Reference Books:
- Lagos State Scheme of Work
- Basic Technology for Junior Secondary Schools by NERDC
Instructional Materials:
- Protractors
- Compasses
- Graph paper
Content:
I. Bisection of Angles
- Definition: Bisection is the process of dividing an angle into two equal parts.
- Method:
- Draw an angle using a protractor.
- Use a compass to mark points on each ray.
- Draw arcs from each marked point to intersect, creating a new ray that bisects the angle.
II. Construction of Specific Angles
- 90° Angle:
- Use a protractor or draw a perpendicular line using a compass and straightedge.
- 45° Angle:
- Construct a 90° angle and then bisect it using the method above.
- 60° Angle:
- Draw an equilateral triangle. Each angle is 60°.
- 30° Angle:
- Construct a 60° angle and bisect it to create a 30° angle.
- Example Steps for 90° Angle Construction:
- Draw a horizontal line.
- Place the protractor’s midpoint at one end of the line.
- Mark 90° and draw a ray.
15 Fill-in-the-Blank Questions:
- Bisection of an angle means to ______ it into two equal parts.
a) Measure
b) Divide
c) Extend
d) Construct - A 90° angle is also known as a ______ angle.
a) Straight
b) Acute
c) Right
d) Obtuse - To construct a 45° angle, you first need to create a ______° angle and then bisect it.
a) 30
b) 60
c) 90
d) 120 - A ______ is used to measure angles accurately.
a) Ruler
b) Protractor
c) Compass
d) Square - The point where two rays meet is called the ______.
a) Base
b) Line
c) Vertex
d) Angle - To draw a 60° angle, you can create an ______ triangle.
a) Isosceles
b) Equilateral
c) Scalene
d) Right - The angle formed by two rays is measured in ______.
a) Meters
b) Degrees
c) Centimeters
d) Liters - To bisect an angle, you need a ______.
a) Ruler
b) Compass
c) Protractor
d) All of the above - An angle of 30° is half of an angle of ______.
a) 60°
b) 90°
c) 120°
d) 150° - The construction of a 90° angle can be done using a ______.
a) Ruler
b) Protractor
c) Compass
d) All of the above - A ______ angle measures more than 90° but less than 180°.
a) Right
b) Acute
c) Obtuse
d) Straight - You can use a compass to find the ______ of an angle.
a) Measure
b) Length
c) Bisection
d) Width - A straight line represents a ______° angle.
a) 90
b) 180
c) 360
d) 270 - The ray that divides an angle into two equal parts is called the ______.
a) Arm
b) Line
c) Bisector
d) Vertex - To construct angles, you need to use a straightedge and a ______.
a) Ruler
b) Pencil
c) Compass
d) All of the above
15 FAQs with Answers:
- What is angle bisection?
It is dividing an angle into two equal parts. - How do you construct a 90° angle?
You can use a protractor or draw a perpendicular line. - Why is it important to construct angles accurately?
Accurate angles are essential in geometry, construction, and design. - What tools do I need for angle construction?
You need a protractor, compass, and ruler. - What is a 45° angle?
It is half of a 90° angle. - How can I create a 60° angle?
You can draw an equilateral triangle. - What does a protractor measure?
It measures angles in degrees. - Can I bisect any angle?
Yes, any angle can be bisected. - How do you find the vertex of an angle?
It is the point where the two rays meet. - What angle is formed by a straight line?
A straight line forms a 180° angle. - How do I verify my angle construction?
You can use a protractor to measure the constructed angle. - What is the relationship between 30° and 60° angles?
A 30° angle is half of a 60° angle. - What is the use of angle construction in real life?
It is used in engineering, architecture, and art. - Can I use a compass to measure angles?
No, a compass is used for construction, not measuring. - How do I practice angle construction?
Use graph paper and practice with a compass and protractor.
Presentation Steps:
Step 1:
The teacher revises the previous topic about angles and their types.
Step 2:
The teacher introduces the new topic by explaining angle bisection and construction techniques.
Step 3:
The teacher allows pupils to contribute, demonstrating their understanding by constructing angles.
Teacher’s Activities:
- Demonstrate angle bisection and constructions.
- Guide students as they practice constructing angles.
- Discuss the applications of constructed angles.
Learners’ Activities:
- Practice constructing angles of 90°, 45°, 60°, and 30° using compasses and protractors.
- Work in pairs to compare their constructions.
- Discuss real-life applications of angles.
Assessment:
- Define angle bisection.
- How do you construct a 90° angle?
- Describe the method for creating a 45° angle.
- Explain the use of a protractor in angle construction.
- Provide two examples of where angles are used in daily life.
- What is the significance of the vertex in an angle?
- How do you ensure accuracy when constructing angles?
- What is a 60° angle used for in construction?
- Describe how to construct a 30° angle.
- What tools are essential for angle construction?
Conclusion:
The teacher goes around to mark the students’ work and provides feedback on their understanding of angle bisection and construction.
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