Answer: Option C. -> 2n
:
C
The 3 lines of symmetry ofan equilateral triangle (a regular polygon with 3sides) divideit into6triangles.

The 4 lines of symmetry of a square (a regular polygon with 4 sides) divide it into 8 triangles.

Hence, a regular polygon with $n$sides will be divided into $2n$triangles when all itslines of symmetry are drawn.

Answer: Option C. -> 2n
:
C
The 3 lines of symmetry ofan equilateral triangle (a regular polygon with 3sides) divideit into6triangles.

The 4 lines of symmetry of a square (a regular polygon with 4 sides) divide it into 8 triangles.

Hence, a regular polygon with $n$sides will be divided into $2n$triangles when all itslines of symmetry are drawn.

Answer: Option C. -> 1-b; 2-a; 3-c; 4-d
:
C
Aregular hexagon has six, a the regular pentagon has five and asquare has four lines of symmetry.A regular polygon of n sides has n lines of symmetry.
A rectangle has only two lines of symmetry as shown below.

:
A wind mill has order 3 rotational symmetry. Did you notice that after the third rotation, it looks exactly as it looked at the start? We got total of three instances where the wind mill looked exactly like as the start.
The key-point is the final position of any object, after 360° rotation will always look like the initial object. So, every object will have rotational symmetry of order 1.
Let us move on to the question now.

In 1, for 360° rotation, we have two instances where it looks like the starting position. That is after 180° and after 360°. So, the order is 2 which will be the value of ‘A’.
But fig. 2 has order 1 because it only repeats itself after 360° rotation. So, B = 1.
That means A + B = 2 + 1 = 3

Answer: Option C. -> 1-b; 2-a; 3-c; 4-d
:
C
Aregular hexagon has six, a the regular pentagon has five and asquare has four lines of symmetry.A regular polygon of n sides has n lines of symmetry.
A rectangle has only two lines of symmetry as shown below.

:
The order of rotational symmetry of a square about its centre is 4.The angle of rotation in a square is ${90}^{\circ }$.

Answer: Option B. -> False
:
B
Every regular polygon has as many lines of symmetry as the number of its sides. So, they have multiple lines of symmetry.

Answer: Option B. -> False
:
B
A mirror line helps to visualise a line of symmetry, a shape has a line of symmetry when half of it is the mirror image of the other half. But it is not applicable in the case of left-right changes in the orientation.
eg. R | Я
When the folded part sits perfectly on top (all edges matching), then the foldlineis aLine of Symmetry.

Answer: Option B. -> False
:
B
Every regular polygon has as many lines of symmetry as the number of its sides. So, they have multiple lines of symmetry.

Answer: Option B. -> False
:
B
If a vertical line is drawn through O, perpendicular to the plane in which pentagon is drawn,then the vertical line is called axisof symmetry. Hence, the given statement is false.