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CHAPTER AT A GLANCE
Symmetry
•Unit: Geometry (Symmetry)
•Board weightage: Lines of symmetry, reflection, paper folding and cutting, rotational symmetry, angles of symmetry and symmetry of the circle give regular 1-mark, 2-mark and 3-mark questions in school examinations (please check your school's latest sample paper)
•Key ideas from the textbook: symmetry as repetition in a definite pattern, line of symmetry by folding, reflection of points, figures with many lines, centre of rotation and angles of symmetry, radial arms, multiples of the smallest angle, factor of 360, symmetry of the circle
•Most scoring part: finding all the lines of symmetry and listing all the angles of symmetry including 360°
•Time to revise: about 50 minutes
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