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Keliling = 14 cm
Panjang kaki segitiga = 5 cm
Dijawab :
K = (2 . panjang kaki segitiga) +a
14 = (2 . 5) +s
14 = 10 +s
14 -10 = s
s = 4
Jadi, panjang alasnya adalah 4 cm.
14cm = 5+5+x
note : 5+5 itu dua sisi segitiga sama kaki.
14 = 10+x
x = 14-10
x = 4cm