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b. K = 2 × ( 22 + 12 ) = 2 × 34 = 68 cm
c. K = 2 × ( 36 + 28 ) = 2 × 64 = 128 cm
d. K = 2 × ( 45 + 27 ) = 2 × 72 = 144 cm
maaf kalau belu tepat :)