Boxes And Sketches
Page 126
Ramya made four more shapes. Each is to be folded along the dotted lines. You have to find out which of these can be made into a box.
Ans: (a) and (c) can be made into box.
Page 127
Shapes that Fold into a Cube
1). Buddha wants to make a paper cube using a squared sheet. He knows that all the faces of a cube are squares.
How many faces does the cube have?
Ans: 6
Will both these shapes fold into a cube?
Ans: Yes, both the shapes can be folded into a cube.
Draw at least one more shape which can fold into a cube.
What will be the area of each face of the cube?
Ans: Area of each face of the cube = Side X Side
Draw one shape which will not fold into a cube.
Look around and discuss which things around you look like a cube. List a few.
Ans: Objects like dice, and rubric cube look like cubes.
Page 128
Find out which of the other 8 shapes (on p 46) can be folded to make an open box.
Draw more shapes that will not fold to make an open box.
Match the shape on the left with a box into which it will fold.
Answer:
Page 129
Have you ever seen a floor map? Here is a floor map of Vibha’s house. It shows where the windows and the doors are in the house. Which is the front side of her house? How many windows are there on the front side?
Ans: The side which contains door is the front side of the house. There are two windows on the front side.
Here are four of houses. Which one is Vibha’s house?
Ans: Drawing (d) is Vibha’s house.
Why do the other three deep drawings not match the floor map? Discuss.
Ans: Drawing (a) shows a straight back wall. So, it does not match with the floor map.
Drawing (b) shows a window on the right side wall. So, it does not match with the floor map.
Drawing (c) shows all the windows of same size. So, it does not match with the floor map.
Page 130
Practice time
1). Look at this floor map of a house. Make doors and windows on the deep drawing of this house.
Answer:
Are there any windows you couldn’t show on the deep drawing? Circle them on the floor map.
Ans: We cannot show the windows of the backside on the deep drawing.
2). Try to make a floor map of your own house.
Soumitro and his friends made deep drawings of a cube. These are their drawings.
Which of the drawings look correct to you? Discuss.
Ans: Drawings (d) and (e) are correct.
Can you add some lines to make drawing (f) into a deep drawing of the cube?
Ans: Yes, drawing (f) can be made into a deep drawing by adding some lines.
Page 131
Puzzle
This cut-out is folded to make a cube. Which of these are the correct deep drawings of that cube?
Ans: (a), (d) and (e) are the correct deep drawings of the cube.
In the same way make a deep drawing of a box which looks like this.
Page 133
If you look at the bridge from the top, how will it look? Choose the right drawing below:
Ans: drawing (b).
Practice time
1) Make drawings to show how this bridge will look
From the top
From the front
From the side
Answer:
From the top
From the front
2) Make a matchbox model which looks like this. Also make a deep drawing of the model in your notebook.
3) How many cubes are needed to make this interesting model?
95 cubes are needed to make the model.
Here are some drawings of the model. Mark the correct top-view drawing with ‘T’ and the correct side view drawing with ‘S’.
Ans: Correct top view is (d)
Correct side view is (b).
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