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= 2 × (50 cm + 20 cm)
= 2 × 70 cm
= 140 cm
K.2= π × d
= 3,14 × 20 cm
= 62,8 cm
K.1 - K.2 = 140 cm - 62,8 cm
= 77,2 cm
b. K = π × d : 2
= 3,14 × 18 cm × : 2
= 56,52 cm : 2
= 28,26 cm