Finding the area of a triangle

Geometry Level 4

In the figure shown above, A D AD is an angle bisector and B E BE is a median. If A B = 4 , B C = 5 AB=4, BC=5 and A C = 6 , AC=6, find the length of A F AF . Give your answer as a decimal number.


The answer is 2.4.

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1 solution

By Ceva's Theorem .

A F F B × B D D C × C E E A = 1 \dfrac{AF}{FB} \times \dfrac{BD}{DC} \times \dfrac{CE}{EA} = 1

By the Angle Bisector Theorem .

B D D C = A B A C = 4 6 \dfrac{BD}{DC}=\dfrac{AB}{AC}=\dfrac{4}{6}

Since B E BE is a median,

C E E A = 1 \dfrac{CE}{EA}=1

Substituting, we get

A F 4 A F × 4 6 × 1 = 1 \dfrac{AF}{4-AF} \times \dfrac{4}{6} \times 1 = 1

4 A F 24 6 A F = 1 \dfrac{4AF}{24-6AF}=1

4 A F = 24 6 A F 4AF=24-6AF

10 A F = 24 10AF=24

A F = 24 10 = AF=\dfrac{24}{10}= 2.4 \boxed{2.4}

How BE median

Kamalsingh Prajapati - 2 years, 10 months ago

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