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2. (a) Derive an expression for the angle (a) between adjacent sides of a regular n- sided polygon (find a as a function of n).

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2. (a) Derive an expression for the angle (a) between adjacent sides of a regular n- sided polygon (find a as a function of n). Fig 2. A regular polygon. (b) Discuss the derived expression and explain that the 3-, 4-, and 6-fold symmetry rotations are allowed in two dimensions, whereas 5-, 7-, and higher fold rotations are not

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