is an angle bisector and is a median. If and find the length of . Give your answer as a decimal number.
In the figure shown above,
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By Ceva's Theorem .
F B A F × D C B D × E A C E = 1
By the Angle Bisector Theorem .
D C B D = A C A B = 6 4
Since B E is a median,
E A C E = 1
Substituting, we get
4 − A F A F × 6 4 × 1 = 1
2 4 − 6 A F 4 A F = 1
4 A F = 2 4 − 6 A F
1 0 A F = 2 4
A F = 1 0 2 4 = 2 . 4