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K lingkaran = K2
K1 = 2(p+l)
K1 = 2(40+20)
K1 = 2(60)
K1 = 120 cm
K2 = phi. d
K2 = 3.14 × 20
K2 = 62.8 cm
K yg diarsir = K1 - K2
K = 120 - 62.8
K = 57.2 cm
jadi K. yang diarsir ialah 57.2 cm A