📐 Chapter 2 – Shapes and Angles
Subject: Mathematics
Main Concepts: Shapes, Angles, Right Angle, More than Right Angle, Less than Right Angle
🔷 Introduction
In our surroundings, we see many shapes made by lines, corners, and sides. Even when two shapes have the same number of sides, they can look different. This happens because of the angles between the sides.
In this chapter, Rohini and Mohini learn that: when angles change, shapes also change.
🟢 Closed Shapes and Open Shapes
✔ Closed Shape
A shape whose starting point and ending point meet is called a closed shape.
✔ Open Shape
A shape whose ends do not meet is called an open shape.
| Type | Description |
|---|---|
| Closed Shape | All sides join to form a complete boundary |
| Open Shape | Sides do not join completely |
📏 Sides and Corners
Every shape is made of:
- Sides – straight lines
- Corners – where two sides meet
📐 What is an Angle?
An angle is formed when two lines meet at a point.
✔ Types of Angles (Class 5 Level)
| Type of Angle | Description |
|---|---|
| Right Angle | Looks like the letter L (90°) |
| Less than Right Angle | Smaller than a right angle |
| More than Right Angle | Bigger than a right angle |
🧰 Angle Tester
An Angle Tester helps us compare angles. It can be made using:
- Two cardboard strips
- A drawing pin
Move the tester around objects like books, doors, and windows. If it opens like an L, it is a right angle.
🖍️ Practice: Identifying Angles
| Object | Type of Angle |
|---|---|
| Scissors | Less than a right angle |
| Book corner | Right angle |
| Open door | More than a right angle |
🧩 Matchstick Shapes
Using matchsticks, we can make different shapes. Changing the angle between matchsticks changes the shape.
Make shapes using 4, 5, 6, and 8 matchsticks. Change the angles and observe how the shape changes.
🌿 Angles Around Us
- Bird beaks 🐦
- Tree branches 🌳
- Clock hands ⏰
- Slides in a park 🎢
⏰ Angles and Time
When the hands of a clock make an L shape, the angle is a right angle.
📄 Activities from the Chapter
✔ Making shapes using tubes and matchsticks
✔ Finding angles in letters of your name
✔ Making a paper aeroplane and finding angles
✍️ Practice Questions
2) Name one object which has a right angle.
3) Can two shapes with the same number of sides look different? Why?
4) How many right angles are there in the letter E?
✅ Quick Revision
✔ Angles are formed at corners
✔ Right angle looks like letter L
✔ Angles are everywhere around us
🎉 Chapter Complete
After studying this chapter, students can confidently identify shapes, angles, and right angles in real life.
📝 Complete Worksheet – Shapes and Angles
Chapter: Shapes and Angles
Purpose: Full practice for exam success 🎯
Section A – Multiple Choice Questions (MCQs)
Q1. An angle that looks like the letter L is called:
Q2. Which of the following is a closed shape?
Q3. An angle smaller than a right angle is:
Q4. Which object usually shows a right angle?
✔ Q2 → (b) A circle
✔ Q3 → (d) Less than right angle
✔ Q4 → (b) Book corner
Section B – Fill in the Blanks
2) A right angle is equal to __________ degrees.
3) An angle bigger than a right angle is called __________.
4) Corners of a shape form __________.
✔ 90
✔ More than a right angle
✔ Angles
Section C – Very Short Answer Questions
1) What is an angle?
2) Name one object which has a right angle.
3) How many sides does a triangle have?
✔ Book corner / Table corner (any one)
✔ 3
Section D – Short Answer Questions
Q1. What is the difference between an open shape and a closed shape?
Q2. Name the three types of angles learned in this chapter.
Q3. Why do shapes change when angles change?
✔ Right angle, less than right angle, more than right angle
✔ Because angles decide how sides are placed in a shape.
Section E – Long Answer Questions
Q1. Explain how you can find a right angle using an angle tester.
Q2. Write three examples of angles found in daily life.
✔ Clock hands, book corner, door, scissors, bird beak (any three)
Section F – HOTS / Thinking Questions ⭐
Q1. Can two shapes have the same number of sides but look different? Explain.
Q2. Why are triangles used in bridges and towers?
✔ Because triangles are strong and do not change shape easily.
🎯 Worksheet Complete
✔ Practice angle identification daily
✔ Revise examples from real life
✔ You are now exam-ready ✅