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Find the perimeter of each of the follow...

Find the perimeter of each of the following shapes: a) An equilateral triangle of side 9cm. b) An isosceles triangle with equal side 8cm each and third side 6cm. c) An isosceles triangle `A B C ,` with `A B=A C=10 c m` and altitude from `A` on `B C` equal to 8cm. d) A regular hexagon with each side measuring 8cm.

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