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mencari r dulu
132 = 22/7 x d
132 x 7/22 = d
42 = d
r = 42/2 = 21
LP = (2 x phi x r kuadrat) + (keliling lingkaran x t)
= (2 x 22/7 x 21 x 21) + (132 x 9)
= 2772 + 1188
= 3960