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<D = <A
EF = BC --> EF = 20
FD = AC--> 9 = y - 4 --> y = 13
DE = AB --> y = x+8 --> x = y- 8 =13 - 8 = 5
x+ y = 5+13 = 18
AC = DF dan
BC = EF
Cari nilai y terlebih dahulu :
AC = DF
y-4 = 9
y = 9+4
y = 13 cm
Cari nilai x :
AB = ED
x+8 = y
x+8 = 13
x = 13-8
x = 5 cm
a. nilai x dan y adalah 5cm dan 13cm
b. Panjang EF = BC = 20 cm
jadi, panjang EF = 20 cm
Semoga membantu :)