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panjang = K : 2 - l
= 60 cm : 2 - 12 cm
= 30 cm - 12 cm = 18 cm
8) a. K = 10+10+4+4+6+6 = 40 cm
b. K = 25+25+25+18+18+18+18+6+6+6+3,5+3,5 = 172 cm