Toy Joy

Given: A picture of Jaya's rocket made of different 3-D shapes (image not visible, so standard rocket model values are used as per NCERT).

A typical rocket model of this type uses:
- Cube: $0$
- Cuboid: $1$
- Cone: $1$
- Cylinder: $2$

(Note: Exact counts depend on the figure. Students should count each shape carefully from their textbook image and fill in accordingly.)

Given: A picture of Jaya's rocket.

By observing the arrangement of shapes in the rocket from bottom to top, the shape that is between the red cuboid and the yellow cuboid is a Cylinder.

(Students should verify by looking at the actual image in their textbook.)

Given: The rocket model built by Jaya.

By observing the image, the shape on top of the orange cylinder is a Cone.

(Students should verify by looking at the actual image in their textbook.)

Given: The rocket model built by Jaya.

By observing the image, the shape under the pink cone is a Cylinder.

(Students should verify by looking at the actual image in their textbook.)

Given: A picture of Devika's toy engine made of different coloured 3-D shapes.

By carefully counting each shape in the toy engine image (standard NCERT answer):
- Red cylinders: $2$
- Yellow cones: $1$
- Grey cuboids: $2$
- Blue cubes: $1$

(Note: Students must count from the actual image in their textbook and fill in the correct numbers.)

Given: Students are asked to look around the classroom and identify real objects that resemble each 3-D shape.

Sample answers for the table:

| Cylinder | Sphere | Cube | Cuboid | Cone |
|---|---|---|---|---|
| Water bottle | Ball | Dice | Chalk box | Birthday cap |
| Drum | Globe | Sugar cube | Brick | Ice cream cone |
| Pencil holder | Marble | Wooden block | Book | Funnel |

(Students should fill in objects they actually find in their own classroom.)

(a) Shape found the most: Cuboid — because books, boxes, chalk boxes, desks, and bricks are all cuboids.

(b) Shape found the least: Cone — cone-shaped objects are not very common in a classroom.

(c) Objects made up of more than one shape:
- A sharpened pencil (cylinder + cone)
- A table (cuboid top + cylindrical or cuboid legs)
- A water bottle with a cap (cylinder + cone or cylinder)

(Students should give examples from their own classroom.)

Given: A set of 3-D shapes shown in the image.

Concept: We identify each shape by its properties:
- Cube – 6 equal square faces, 12 equal edges, 8 corners.
- Cone – 1 circular flat face, 1 curved surface, 1 apex (pointed top).
- Cylinder – 2 circular flat faces, 1 curved surface, no corners.
- Cuboid – 6 rectangular faces (may not all be equal), 12 edges, 8 corners.

Instructions to follow on the image:
- ⭕ Circle all shapes that are cubes.
- ✔ Tick all shapes that are cones.
- ✖ Cross all shapes that are cylinders.
- ☐ Draw a box around all shapes that are cuboids.

(Students should apply these markings directly on the shapes shown in their textbook image, identifying each shape by its properties as described above.)

Given: We need to identify 3-D shapes based on their properties — faces, edges, and surfaces.

Concept: Properties of 3-D shapes:
- Sphere – 0 edges, 0 flat faces, 1 curved surface.
- Cube/Cuboid – all flat (rectangular/square) faces, all straight edges.
- Cylinder – 2 flat circular faces + 1 curved surface; edges are curved circles.
- Cone – 1 flat circular face + 1 curved surface; 1 curved edge at the base.

(a) Shape with no edges:
$$\boxed{\text{Sphere}}$$
A sphere has no edges and no corners — it is perfectly round.

(b) Shape with only flat faces:
$$\boxed{\text{Cube and Cuboid}}$$
All faces of a cube and cuboid are flat (square or rectangular).

(c) Shape with only curved faces:
$$\boxed{\text{Sphere}}$$
A sphere has only one curved surface and no flat face.

(d) Shape with both straight and curved edges:
$$\boxed{\text{Cylinder and Cone}}$$
A cylinder has two circular (curved) edges. A cone has one circular (curved) edge at its base.

(e) Shape with both flat and curved faces:
$$\boxed{\text{Cylinder and Cone}}$$
A cylinder has 2 flat circular faces and 1 curved surface.
A cone has 1 flat circular face and 1 curved surface.