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Untuk soal yang layang layang, kalau CB = CD, AB = AD, sehingga CB = 12, AB.AB = 24.24 - 7.7 = 25.25, jadi AB = 25.. Sehingga, keliling nya 12+12+25+25 = 74 cm..
Gak bisa ketik kuadrat , jadinya maaf kalau agak bingung