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Verified answer
A. K = 22/7 x 42 x 2 = 22 x 12 = 264 cmb. K = 3,14 x 15 x 2 = 94,2 cm
c. K = 22/7 x 6,3 x 2 = 22 x 1,8 = 39,6 cm
d. K = 3,14 x 2,6 x 2 = 3,14 x 5,2 = 16,328 cm