3 Marks Question

Question 13 Marks

Copy the drawing on squared paper. Complete such that the resulting figure has two dotted lines as two lines of symmetry.

Answer

The above given figure can be completed by drawing the same parts as shown in the given figure.
We can draw this by drawing horizontal and vertical line of symmetry.
Therefore, to have these dotted lines as the axis of symmetry.
The above given figure can be completed as follows:

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Question 23 Marks

Copy the drawing on squared paper. Complete such that the resulting figure has two dotted lines as two lines of symmetry.

Answer

The above given figure can be completed by drawing the same parts as shown in the given figure
We can draw this by drawing horizontal and vertical line of symmetry
Therefore, to have the dotted lines as the axis of symmetry
The above given figure can be completed as follows:

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Question 33 Marks

Copy the drawing on squared paper. Complete such that the resulting figure has two dotted lines as two lines of symmetry.

Answer

The above given figure can be completed by drawing the same parts as shown in the given figure.
We can draw this by drawing horizontal and vertical line of symmetry.
Therefore, to have the dotted lines as the axis of symmetry.
The above given figure can be completed as follows:

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Question 43 Marks

Copy the drawing on squared paper. Complete such that the resulting figure has two dotted lines as two lines of symmetry.

Answer

The above given figure can be completed by drawing the same parts as shown in the given figure
We can draw this by drawing horizontal and vertical line of symmetry
Therefore, these dotted lines as the axis of symmetry
The above given figure can be completed as follows:

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Question 53 Marks

Copy the drawing on squared paper. Complete such that the resulting figure has two dotted lines as two lines of symmetry.

Answer

The above given figure can be completed by drawing the same parts as shown in the given figure
We can draw this by drawing horizontal and vertical line of symmetry
Therefore, to have these dotted lines as the axis of symmetry
The above given figure can be completed as follows:

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Question 63 Marks

Copy the drawing on squared paper. Complete such that the resulting figure has two dotted lines as two lines of symmetry.

Answer

The above given figure can be completed by drawing the same parts as shown in the given figure
We can draw this by drawing horizontal and vertical line of symmetry
Therefore, to have these dotted lines as the axis of symmetry
The above given figure can be completed as follows:

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Question 73 Marks

Write the number of lines of symmetry in each letter of the word $‘SYMMETRY’.$

Answer

The given word is $'SYMMETRY'$. The letter $S$ has one line of symmetry. The letter $Y$ hase one line of symmetry. The letter $M$ hase one line of symmetry. The letter $E$ hase one line of symmetry. The letter $T$ hase one line of symmetry. The letter $R$ hase one line of symmetry.

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Question 83 Marks

Complete the following table.

Shape	Rough figure	Number of lines of symmetry
Equilateral triangle		3
Square
Rectangle
Isosceles triangle
Rhombus
Circle

Answer

Shape	Rough figure	Number of lines of symmetry
Equilateral triangle		3
Square		4
Rectangle		2
Isosceles triangle		1
Rhombus		2
Circle		infinitr

In case of a circle are infinite lines. Here some lines of symmetry drawn similarly we may draw more symmetric lines for it.

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Question 93 Marks

Complete the figure so that line l becomes the line of symmetry of the whole figure.

Answer

As we know that, a line of symmetry divides a figure into two parts, such that when the figure is folded about the line, the two parts of the figure coincide. The complete figure is shown below.

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Question 103 Marks

Draw the images of the points $A, B$ and $C$ in the line m figure. Name them as $A', B'$ and $C'$, respectively and join them in pairs. Measure $AB, BC, CA, A'B', B'C'$ and $C'A'$. Is $AB = A'B', BC = B'C'$ and $CA = C'A$'?

Answer

The images of the points $A, B$ and $C$ in the line m are $A’, B’$ and $C’$ respectively as shown below.

It is clear that, $AB = A’B’, BC = B’C’$ and $CA = C’A’.$

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Question 113 Marks

Complete figure by taking l as the line of symmetry of the whole figure.

Answer

As we know that, a line of symmetry divides a figure into two parts, such that when the figure is folded about the line, the two parts of the figure coincide.$\therefore$ The complete figure is as shown below.

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Question 123 Marks

In each figure alongside, a letter of the alphabet is shown along with a vertical line. Take the mirror image of the letter in the given line. Find which letters look the same after reflection (i.e. which letters look the same in the image) and which do not. Can you guess why?

Answer

The mirror images of these figures will be as following.

The letters that are having vertical line of symmetry will be having same mirror images these lettrs are $O, M, H, T, V, X$ and hence these letters will look the same.

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