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8▪▪▪▪▪ 6
-----=-----
8+a▪▪▪10
dikali silang
80= 6(8+a)
80= 48+ 6a
80-48 = 6a
32 = 6a
a = 32÷6
a= 16/3
atau konsepnya
segitiga kecil
--------------------
segitiga besar
kaya gituu