Properties of 3−D objects
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.
A cube has 6 plane faces, 12 edges and 8 vertices. All the six faces are equal.
ExamplesDice, ice cubes, building blocks, rubiks
A cuboid has 6 plane faces. 12 edges and 8 vertices. Its opposite faces are equal.
ExamplesMatch box, bricks, eraser, book, toothpaste box.
A sphere has only one curved surface. It has no vertices and edges.
ExamplesShotput, ball, globe, laddu.
A cone has one plane face and one curved surface. It has one vertex.
ExamplesCone ice cream, Joker‛s cap
A cylinder has 2 plane faces and 1 curved surface.
It has no edges and vertices.
Examplesstraw, gas cylinder, pipe.
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(i) Fold and form cube from the following nets
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(ii) Use these nets to form cuboids.
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(iii) Make a cone with semicircle.
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(iv) Make a cylinder using rectangle sheet.
Try it
Make 3−D shapes using clay. (Individual Activity)
