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Class 7th Science
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Class 7th Math
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Class 7 Social Science Geography
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Class 7 Social Science History
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Class 7 Social Science Civics
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Class 7 English Honeycomb
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Class 7 English Honeycomb Poem
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Class 7 English An Alien Hand Supplementary
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Online Class For 7th Standard Students (CBSE)
About Lesson

Solution:-

The given net can be folded as cube.

Because, it can be folded as below,

Solution:-

The given net cannot be folded as cube.

Because, it can be folded as below,

2. Dice are cubes with dots on each face. Opposite faces of a die always have a total of seven dots on them.

By observing the above figure the sum of the opposite faces is equal to 7.

So, the given net can be folded into a net of dice.

(ii)

No, this cannot be a net for a die.

By observing the figure we can say that, one pair of opposite face will have 1 and 4, another pair of opposite face will have 3 and 6 the sum of these two opposite faces are not equal to 7.

4. Here is an incomplete net for making a cube. Complete it in at least two different ways. Remember that a cube has six faces. How many are there in the net here?

(Give two separate diagrams. If you like, you may use a squared sheet for easy manipulation.)

Because, the net (iii) can be folded as cylinder.

(c) (iv)

Solution:-

Solution:-

2. The dimensions of a cuboid are 5 cm, 3 cm and 2 cm. Draw three different isometric sketches of this cuboid.

Solution:-

From the question it is given that dimension of a cuboid are 5 cm, 3 cm, and 2 cm.

The three different isometric sketches of this cuboid is shown below,

1

2

3. Three cubes each with 2 cm edge are placed side by side to form a cuboid. Sketch an oblique or isometric sketch of this cuboid.

Solution:-

Oblique sketch

Isometric sketch

5. Give (i) an oblique sketch and (ii) an isometric sketch for each of the following:

(a) A cuboid of dimensions 5 cm, 3 cm and 2 cm. (Is your sketch unique?)

(b) A cube with an edge 4 cm long.

Solution:-

(a)

(i) Oblique sketch

(ii) Isometric sketch

(ii) Isometric sketch