Q61Written answer
A circle has two lines of symmetry.
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Ans: Circle can have an infinite number of symmetries, not two.
Therefore, the given statement is False.
NCERT Exemplar · Class 7 · Maths
Chapter 12: Practical Geometry Symmetry and Visualising Solid Shapes
Practice each question, then open the answer or worked solution.
Textbook exercises
124 questionsQ62Written answer
An angle has two lines of symmetry.
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Ans: Bisector is only the line of symmetry of an angle.
Therefore, the given statement is False.
Q63Written answer
A regular hexagon has six lines of symmetry.
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Ans: The number of lines of symmetry in a polygon is equal to its number of sides.
Therefore, the given statement is True.
Q64Written answer
An isosceles trapezium has one line of symmetry.
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Ans: An isosceles trapezium has only one line of symmetry which is along the line joining the mid-points of the two opposite sides.
Therefore, the given statement is True.
Q65Written answer
A parallelogram has two lines of symmetry.
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Ans: Parallelogram possesses zero line of symmetry.
Therefore, the given statement is False.
Q66Written answer
Order of rotational symmetry of a rhombus is four.
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Ans: The order of rotational symmetry of a rhombus is only two not four.
Therefore, the given statement is False.
Q67Written answer
An equilateral triangle has six lines of symmetry.
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Ans: An equilateral triangle has three lines of symmetry along the median of the triangle.
Therefore, the given statement is False.
Q68Written answer
Order of rotational symmetry of a semi circle is two.
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Ans: The order of rotational symmetry of a semicircle is only one.
Therefore, the given statement is False.
Q69Written answer
In an oblique sketch of the solid, the measurements are kept proportional.
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Ans: The measurements are not kept proportional in the oblique sketch of the solid.
Therefore, the given statement is False.
Q70Written answer
An isometric sketch does not have proportional length.
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Ans: An isometric sketch always possesses a proportional length.
Therefore, the given statement is False.