12/4 + 4 = 18/x
12/8 = 18/x
12x = 18.8
12x = 144
x = 12 cm
maka panjang EF adalah 12 cm
PEMBAHASAN
Kesebangunan
Karena DE = EA = 4 cm
Maka,
panjang EF
= (CD + AB)/2
= (12 + 18)/2
= 30/2
= 15 cm
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12/4 + 4 = 18/x
12/8 = 18/x
12x = 18.8
12x = 144
x = 12 cm
maka panjang EF adalah 12 cm
PEMBAHASAN
Kesebangunan
Karena DE = EA = 4 cm
Maka,
panjang EF
= (CD + AB)/2
= (12 + 18)/2
= 30/2
= 15 cm