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Unit 16 Brain Teaser | Rotational Symmetry | Class-8 DAV Secondary Mathematics
Q1A. Tick (✓) the correct option.
(i) How does the shape look like after it rotates 180°?
(ii) Letter ‘I’ has rotational symmetry of order
(a) 1 (b) 2 (c) 3 (d) 4
(iii) The angle of rotation of a figure is 36° so, its order of rotational symmetry is
(a) 1 (b) 9 (c) 10 (d) 1
(iv) Regular pentagon has a rotational symmetry of order
(a) 2 (h) 4 (c) 5 (d) 3
(v) The angle of rotation of the given figure in
(a) 90° (b) 180° (c) 270° (d) 360°
Q1B. Answer the following questions.
(i) Name two letters of English alphabet which have no rotational symmetry.
(ii) Find the angle and order of rotational symmetry of the figure given along side.
(iii) Which letters of English alphabet have rotational symmetry of order 2?
(iv) Does isosceles triangle exhibit rotational symmetry? Give reason.
(v) Find the angle of rotation and order of rotation in the figure given along aide.
Q2. Name one figure each having rotational symmetry of order.
(i) 4 (ii) 2 (iii) 3 (iv) 6
Q3. In the word ‘MATHS’ which letter shows rotational symmetry of order 2?
Q4. List two letters of English alphabets which exhibit both line as well as rotational symmetry.
Q5. Find the angle of rotation for each of the following.
Q6. Write the order of rotational symmetry of a square and equilateral triangle with the help of rough sketches.
Very Best
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it is really helpful