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Question

In triangle ABC, base BC and area of triangle Δ are fixed. Locus of the centroid of triangle ABC is a straight line that is


A

parallel to side BC

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B

right bisector of side BC

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C

right angle of BC

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D

inclined at an angle to side BC

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Solution

The correct option is A

parallel to side BC


Δ=12(BC)h,where 'h' is the distance of vertex 'A' from side BC.ΔGBC=Δ3=(BC)h6,where 'G' is centroid.h=2Δ(BC)=constantThus distance of vertex 'A' from side is fixed. This implies that distance of centroid from side BC will be fixed, hence locus of 'G' will be a line parallel to BC.


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