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5 12 13. dikali 3
25 36 39. ketemu setengah panjang alasnya yaitu 25
jd panjang sisi persegi 25x2=50
Kpersegi = 4x50 = 200
Lsegitiga = axt\2 = 50X39\2 = 1950\2= 975
LPlimas = 4x Lsegitiga + Lpersegi
= 4x (975) + 200
= 3900 + 200
= 4100