Lines Angles and Bearing Mathematics Primary 5 Third Term Lesson Notes Week 2

Subject: Mathematics
Class: Primary 5
Term: Third Term
Week: 2
Topic: Lines, Bearing, and Angles
Sub-topic: Introduction to Lines and Angles
Duration: 40 minutes

Behavioural Objectives:
By the end of the lesson, pupils should be able to:

1. Identify straight lines, curves, and angles.
2. Differentiate between acute and obtuse angles.
3. Recognize north, south, east, and west directions.

Key Words:

• Straight line, curve, angle, north, south, east, west, acute angle, obtuse angle.

Entry Behaviour:
Pupils are familiar with basic shapes like circles, triangles, and squares.

Learning Resources and Materials:

• Ruler
• Protractor
• Compass
• Directional signs (N, S, E, W)
• Drawing paper
• Pencils
• Lagos State Scheme of Work

Building Background / Connection to Prior Knowledge:
Pupils already understand basic shapes and how to draw lines and circles.

Embedded Core Skills:

• Critical thinking
• Collaboration
• Communication

Learning Materials:

• Chalkboard/Whiteboard
• Markers or chalk
• Chart paper
• Flashcards

Reference Books:

• Lagos State Scheme of Work
• Mathematics textbooks

Instructional Materials:

• Flashcards with pictures of lines and angles
• Posters of directions (N, S, E, W)

Content:

• Review previous topic of basic shapes.
• Introduction to straight lines and curves.
• Discuss angles: acute and obtuse.
• Identify directions: north, south, east, and west.

Lines

1. Straight Line: It is a straight path that goes on forever in both directions. For example, the edge of a ruler is like a straight line.
2. Ray: It starts at one point and goes on forever in one direction. Imagine a flashlight beam that starts at the light and continues out.
3. Line Segment: It is a part of a line that has two endpoints. For example, the length of your pencil is a line segment.
4. Parallel Lines: These are lines that never meet. They stay the same distance apart. 🛣️ For example, the two rails of a train track.
5. Perpendicular Lines: These are lines that cross at a right angle (90 degrees). For example, a plus sign (+) or the corner of a paper.

Bearing

1. Bearing: It is the direction from one place to another, measured in degrees from the north direction.
2. How to Read Bearing: Always measure from the north, going clockwise. For example, if a place is east, its bearing is 90°.
3. Example: If you are standing at point A and want to find the bearing to point B, you first face north. Then, you turn clockwise towards point B. Measure the angle you turned in degrees.

Angles

1. Angle: It is the space between two lines that meet at a point. 🟰
2. Acute Angle: It is less than 90 degrees. Like the angle of a slice of pizza. 🍕
3. Right Angle: It is exactly 90 degrees. Like the corner of a square.
4. Obtuse Angle: It is more than 90 degrees but less than 180 degrees. Like the angle of a door when it’s slightly open.
5. Straight Angle: It is exactly 180 degrees. It looks like a straight line.
6. Reflex Angle: It is more than 180 degrees but less than 360 degrees. Like the angle of a door opened very wide.

Class Activity Discussion :

1. What is a line?
   • A line is a straight path that goes on forever in both directions.
2. What is a ray?
   • A ray starts at one point and goes on forever in one direction.
3. What is a line segment?
   • A line segment is a part of a line that has two endpoints.
4. What are parallel lines?
   • Parallel lines are lines that never meet and stay the same distance apart.
5. What are perpendicular lines?
   • Perpendicular lines are lines that cross each other at a right angle (90 degrees).
6. What is a bearing?
   • Bearing is the direction from one place to another, measured in degrees from the north direction.
7. How do you measure bearing?
   • To measure bearing, start facing north, and turn clockwise to the direction you want to measure.
8. What is an angle?
   • An angle is the space between two lines that meet at a point.
9. What is an acute angle?
   • An acute angle is less than 90 degrees.
10. What is a right angle?
    • A right angle is exactly 90 degrees.
11. What is an obtuse angle?
    • An obtuse angle is more than 90 degrees but less than 180 degrees.
12. What is a straight angle?
    • A straight angle is exactly 180 degrees and looks like a straight line.
13. What is a reflex angle?
    • A reflex angle is more than 180 degrees but less than 360 degrees.
14. What is the bearing of east?
    • The bearing of east is 90 degrees.
15. What is the bearing of south?
    • The bearing of south is 180 degrees.

Evaluation :

1. A line that goes on forever in both directions is called a ___.
   • a) ray
   • b) line segment
   • c) line
   • d) point
2. A part of a line that has two endpoints is called a ___.
   • a) ray
   • b) line segment
   • c) line
   • d) circle
3. A line that starts at one point and goes on forever in one direction is called a ___.
   • a) ray
   • b) line segment
   • c) parallel line
   • d) angle
4. Lines that never meet are called ___.
   • a) perpendicular lines
   • b) reflex lines
   • c) parallel lines
   • d) straight lines
5. Lines that cross at a right angle (90 degrees) are called ___.
   • a) parallel lines
   • b) perpendicular lines
   • c) straight lines
   • d) reflex lines
6. The direction from one place to another, measured in degrees from north, is called ___.
   • a) angle
   • b) bearing
   • c) line
   • d) point
7. When measuring bearing, start facing ___.
   • a) east
   • b) south
   • c) west
   • d) north
8. An angle that is exactly 90 degrees is called a ___.
   • a) right angle
   • b) obtuse angle
   • c) acute angle
   • d) straight angle
9. An angle that is less than 90 degrees is called a ___.
   • a) obtuse angle
   • b) right angle
   • c) reflex angle
   • d) acute angle
10. An angle that is more than 90 degrees but less than 180 degrees is called a ___.
    • a) right angle
    • b) acute angle
    • c) straight angle
    • d) obtuse angle
11. A straight angle is equal to ___.
    • a) 45 degrees
    • b) 90 degrees
    • c) 180 degrees
    • d) 270 degrees
12. A reflex angle is more than ___.
    • a) 90 degrees
    • b) 180 degrees
    • c) 360 degrees
    • d) 270 degrees
13. The bearing of south is ___.
    • a) 0 degrees
    • b) 90 degrees
    • c) 180 degrees
    • d) 270 degrees
14. The bearing of west is ___.
    • a) 0 degrees
    • b) 90 degrees
    • c) 180 degrees
    • d) 270 degrees
15. The bearing of east is ___.
    • a) 0 degrees
    • b) 90 degrees
    • c) 180 degrees
    • d) 270 degrees

Presentation:

Step 1:

• Teacher’s Activities:
  • Review the previous topic: basic shapes.
• Learners’ Activities:
  • Answer questions about basic shapes.

Step 2:

• Teacher’s Activities:
  • Introduce straight lines and curves using examples on the board.
  • Draw examples of acute and obtuse angles.
  • Discuss and show directions using signs.
• Learners’ Activities:
  • Listen and observe the teacher’s explanation.
  • Look at the examples on the board.

Step 3:

• Teacher’s Activities:
  • Allow pupils to identify and draw straight lines and curves.
  • Ask pupils to identify acute and obtuse angles from examples.
  • Encourage pupils to point out north, south, east, and west.
• Learners’ Activities:
  • Draw lines and curves on paper.
  • Identify acute and obtuse angles.
  • Point out directions using the signs provided.

Assessment:

• Observe pupils as they draw lines, angles, and identify directions.
• Ask oral questions to check understanding.

Evaluation Questions:

1. What is a straight line?
2. Draw a curve on your paper.
3. What angle is less than 90 degrees called?
4. What angle is more than 90 degrees called?
5. Point to the direction that is north.
6. Which direction is east?
7. Which direction is south?
8. Which direction is west?
9. Draw an acute angle on your paper.
10. Draw an obtuse angle on your paper.

Conclusion:

• The teacher goes around to mark pupils’ work and offers corrections.
• Praise pupils for their efforts and review any errors.
• Encourage pupils to practice drawing lines and identifying angles at home.