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jadi CF=5
CD =5 X3=15
BE=DF
BE=15-5=10
= 13² - 12²
= 169 - 144
= 25
CF = √25
= 5
Panjang CD = 3 × CF
= 3× 5
= 15
Panjang DF = Panjang BE
Panjang BE = 15 - 5 = 10 cm (D)