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