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b. K = 12+12+10 = 34 cm
c. K = 14+14+14 = 42 cm
2. a. sisi kosong = 46-(13+15) = 46-28=18 cm
b. sisi kosong = 74-24=50 : 2= 25 cm
c. sisi kosong = 108 : 3 = 36 cm