Plane Shapes – Grade 5 Lesson Note on Mathematics, Third (3rd) Term, (Week 2) | National Unified Examination (NUE), NAPPS Scheme
LESSON NOTE: WEEK 2
SUBJECT: Mathematics
TOPIC: Plane Shapes
CLASS: Grade 4
DATE: 5th May – 9th May
TOPIC OVERVIEW:
This week’s topic focuses on understanding plane shapes through the concepts of parallel and perpendicular lines, properties of triangles, introduction to geometry symbols, properties of quadrilaterals, and basic quantitative reasoning involving angles.
OBJECTIVES:
At the end of the lesson, pupils should be able to:
- Identify and draw parallel and perpendicular lines.
- Describe and classify different types of triangles.
- Use correct geometry symbols to label parallel and perpendicular lines.
- Identify and state properties of trapezium, parallelogram, and rhombus.
- Solve simple quantitative aptitude questions involving triangle angles.
INSTRUCTIONAL MATERIALS:
- Rulers
- Protractors
- Plane shape charts
- Flashcards with symbols
- Chalkboard and marker diagrams
- Paper cut-outs of shapes
PREVIOUS KNOWLEDGE:
Pupils already know basic 2D shapes like square, circle, triangle, and rectangle.
CONTENT OUTLINE:
Subtopics Covered:
- Parallel and perpendicular lines
- Properties of triangles (Equilateral, Isosceles, Scalene)
- Symbols: parallel lines (//), perpendicular lines (⊥)
- Properties of trapezium, parallelogram, and rhombus
- Quantitative aptitude involving triangle angles
TEACHER’S EXPLANATION & EXAMPLES:
1. Parallel and Perpendicular Lines:
- Parallel lines: Lines that never meet and are equidistant (e.g., AB // CD).
- Perpendicular lines: Lines that meet at 90 degrees (e.g., EF ⊥ GH).
2. Properties of Triangles:
- Equilateral Triangle: 3 equal sides, 3 equal angles (60° each).
- Isosceles Triangle: 2 equal sides, 2 equal angles.
- Scalene Triangle: No equal sides or angles.
3. Geometry Symbols:
- Use “//” for parallel (e.g., MN // PQ)
- Use “⊥” for perpendicular (e.g., XY ⊥ ZW)
4. Properties of Shapes:
- Trapezium: One pair of parallel sides
- Parallelogram: Opposite sides are equal and parallel
- Rhombus: All sides equal, opposite angles equal
5. Quantitative Aptitude:
- Triangle angle sum = 180°
- Example: If angle A = 60°, B = 80°, then angle C = 180 – (60 + 80) = 40°
LEARNERS’ ACTIVITIES:
- Identify and draw examples of parallel/perpendicular lines
- Draw and label triangle types
- Use rulers and protractors to label line symbols
- Match shapes to their properties
- Solve angle-related problems in triangles
CONCLUSION / SUMMARY:
Pupils can now identify and draw various plane shapes, correctly use geometric line symbols, describe triangle types, and explain the properties of common quadrilaterals. They are also able to solve basic problems involving angle sums in triangles.
HOME FUN (ASSIGNMENT):
- Draw and label three types of triangles.
- Identify and write the names of two items at home that show parallel lines.
- Find the missing angle in a triangle with angles 65° and 75°.