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= (Keliling persegi panjang) - (Kleiling 1/2 lingkaran)
= (2 (p + l) ) - (1/2 x π x d)
= (2 (35 + 28)) - (1/2 x 22/7 x 28)
= (2 x 63) - (11 x 4)
= 126 - 44 = 82 cm