A plane 2−dimensional shape that can be folded to form a 3−dimensional shape is called a net.

__Properties
of 3−D objects__

**Create 3D objects using clay and
paper folding.**

A plane 2−dimensional shape that
can be folded to form a 3−dimensional shape is called a net. Nets are used to
make floor maps of houses, layout planes of buildings, bridges and so on.

__Cube__

A cube has 6 plane faces, 12
edges and 8 vertices. All the six faces are equal.

**Examples**

Dice, ice cubes, building blocks,
rubiks

__Cuboid__

A cuboid has 6 plane faces. 12
edges and 8 vertices. Its opposite faces are equal.

**Examples**

Match box, bricks, eraser, book,
toothpaste box.

__Sphere__

A sphere has only one curved
surface. It has no vertices and edges.

**Examples**

Shotput, ball, globe, laddu.

__Cone__

A cone has one plane face and one
curved surface. It has one vertex.

**Examples**

Cone ice cream, Joker‛s cap

__Cylinder__

A cylinder has 2 plane faces and
1 curved surface.

It has no edges and vertices.

**Examples**

straw, gas cylinder, pipe.

__Activities__

**a. Fold and form cube from the
following nets**

**b. Use these nets to form
cuboids.**

**c. Make a cone with semicircle. **

**d. Make a cylinder using
rectangle sheet.**

**Try it**

Make 3−D shapes
using clay. (Individual Activity)

Tags : Geometry | Term 1 Chapter 1 | 4th Maths , 4th Maths : Term 1 Unit 1 : Geometry

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

4th Maths : Term 1 Unit 1 : Geometry : Properties of 3−D objects | Geometry | Term 1 Chapter 1 | 4th Maths

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