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Question

In the figure, ABC and ABD are two triangles on the same base AB. If line segment CD is bisected by ¯¯¯¯¯¯¯¯AB at O, show that area(ABC)=area(ABD).
569760_f2cf688dd62c4240aead668fcea097a6.png

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Solution

Given In the figure, triangle ABC and triangle ABD are two triangles on the same base AB. If line segment CD is bisected by AB at O

Then O is the midpoint of CD

In triangle ACD

OC=OD

So OA is the median

area(ΔAOC)=area(ΔAOD)...........................(1)

Then O is the midpoint of CD

In triangle BCD

OC=OD

So OB is the median

area(ΔBOC)=area(ΔBOD)...........................(2)

Adding (1) and (2) we get

area(ΔAOC)+area(ΔBOC)=area(ΔAOD)+area(ΔBOD)

area(ΔABC)=area(ΔABD) [henceproved]

711870_569760_ans_c6823ceb9694405b85c26e81d2ce8ff2.png

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