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= pi * r^2 + pi * r * s
= pi * r ( r + s)
= 3.14 * 6 ( 6 + 10)
= 301.44
d = 12, r = 12 :2 = 6, t = 8 , phi = 3,14
s = √8²-6² = √64+36 = 10
= 3,14 x 6 (6 + 10)
= 18,64 (16) = 301,44 (d)