Summary
Chapter 2 of the Class 3 Maths NCERT textbook (Maths Mela), "Toy Joy", introduces young learners to 3D shapes — cube, cuboid, cylinder, cone, and sphere — through hands-on activities involving toys, boxes, and everyday objects, helping children identify, name, and describe the faces, edges, and corners of each shape.
- Identifying 3D Shapes — Children learn to recognise five solid shapes — cube, cuboid, cylinder, cone, and sphere — by looking at toys, bottles, boxes, and classroom objects. They count and name each shape in models such as a toy engine and a rocket.
- Faces, Edges, and Corners — The chapter introduces the parts of a 3D shape: its flat or curved faces, straight or curved edges, and corners. Children practise sorting shapes by whether they have only flat faces, only curved faces, or a mix of both.
- Building and Combining Shapes — Learners explore what happens when shapes are joined together, for example joining a cube and a cuboid, or stacking cubes in different ways. Activities include making houses, towers, and rockets using available shapes.
- Shape Hunt in the Classroom — Children search the classroom for real objects that match each of the five shapes and record their findings in a table, identifying which shape appears most often and which appears least.
Key points & formulas
- 01Five 3D shapes are taught: cube, cuboid, cylinder, cone, and sphere.
- 02Each shape is described by its faces (flat or curved), edges (straight or curved), and corners.
- 03A cube is a special type of cuboid.
- 04Opposite faces on a die (cube) always add up to 7 — for example, the face opposite 1 has 6 dots.
- 05Children count and record how many of each shape make up a toy engine (cylinders, cones, cuboids, and cubes).
- 06Joining 3 cubes can produce different shapes depending on the arrangement.
- 07Real objects in the classroom are matched to each shape, building the link between geometry and everyday life.
Frequently asked questions
01What is Chapter 2 Toy Joy about in Class 3 Maths Mela?
Toy Joy introduces children to five 3D shapes — cube, cuboid, cylinder, cone, and sphere. Using toys, boxes, and bottles as examples, children learn to name each shape and describe its faces, edges, and corners.
02Which shapes are covered in this chapter?
The five shapes are cube, cuboid, cylinder, cone, and sphere. The chapter also notes that a cube is a special type of cuboid.
03What are faces, edges, and corners of a shape?
A face is a flat or curved surface on a 3D shape. An edge is where two faces meet and can be straight or curved. A corner is the point where edges meet. Children sort shapes based on these features in the chapter.
04Which shapes have only flat faces?
The chapter asks children to name shapes with only flat faces, which applies to shapes like the cube and cuboid that have no curved surfaces.
05Which shapes have only curved faces?
The chapter asks children to identify shapes with only curved faces. A sphere, for example, has no flat faces and no edges.
06What is the fun game about the die in this chapter?
Children look at a die (which is a cube) and find out what number appears on the face opposite each number from 1 to 6. They are asked to notice the pattern in how opposite faces are related.
07How does the rocket activity help children learn about shapes?
Jaya's rocket is made up of several different 3D shapes. Children count how many cubes, cuboids, cones, and cylinders she used, practising shape recognition within a combined object.
08What is the Construct and Describe game in this chapter?
Children sit in groups. One student picks three shapes, puts them together, and then describes the arrangement to the group. The other students try to build the same structure without seeing the original, which builds both spatial thinking and communication skills.
09Can children use everyday materials for the activities in this chapter?
Yes. The chapter encourages children to use old boxes, cans, bottles, clay, sticks, and dice available at home or in the classroom to make and explore the shapes described.
10How many ways can you join 3 cubes together?
The chapter asks children to try joining 3 cubes in as many different ways as possible and observe the different shapes they can create, making it an open-ended exploration activity.
11What does the toy engine activity involve?
Devika's toy engine is made from a mix of red cylinders, yellow cones, grey cuboids, and blue cubes. Children count how many of each colour and shape are used in the engine.
12Why is this chapter called Toy Joy?
The chapter uses toys, craft objects, and play-based activities as the main context for exploring 3D shapes. Building animals on boxes, making rockets, and playing board games all make learning about shapes enjoyable for Class 3 children.
More chapters in Maths Mela
Read Chapter 2 of Maths Mela, the Class 3 Mathematics NCERT textbook (2026-27 edition), online for free: the complete chapter as published by NCERT with every diagram, solved example and exercise, with step-by-step solutions, answers and revision notes. Open the NCERT PDF above, or browse all NCERT Class 3 textbooks.
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