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A regular polygon of side 15 cm has an interior angle of 144°. The polygon represents a metal disc which is 2.5 mm thick and is made of a metal whose density is 9.6 g/#cm^3.#
a) Determine the number of sides of the polygon.
b) Calculate to one decimal place
i. the surface area of the disc
ii. the volume of metal in the disc.
iii. the mass of the disc in kilograms