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Question

If E is the mid point of median AD in triangle ABC, then prove that :
Area (ΔABE) = 14 Area (ΔABC).

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Solution

Given, AD is the median of triangle ABC.
So, AD will divide triangle ABC into two triangles of equal area.
Thus,
Area of triangle (ABD) = Area of triangle (ADC)
or, Area(ABD)=12Area(ABC) ... (1)
Again, E is the mid-point of AD. So, BE will be the median of triangle ABD.
So, Area of triangle (ABE) = Area of triangle (BED)
or, Area(ABE)=12Area(ABD)
Therefore, Area(ABE)=14Area(ABC) [using (1)]
Hence proved!!


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