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Show that a median of a triangle divide...

Show that a median of a triangle divides it into two triangles of equal areas.

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Please refer to the diagram in the video.
Here, `AD` is median to `BC` such that `BD=CD`
and `AE_|_BC`. `ar(ABD) = 1/2xxAExxBD`
`=1/2xxAExxCD`(as BD=CD)
`=ar(ACD)`
As, `ar(ABD) = ar(ACD)`,
it shows a median of a triangle divides it into two triangles of equal areas.
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