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Question

In Fig, APBQCR. Prove that ar(AQC)=ar(PBR)
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Solution

Given: APBQ.
We can say that perpendicular distance from A to BQ is equal to perpendicular distance from P to BQ.
Let it be d1.
ar(AQB)=12×BQ×d1

ar(PQB)=12×BQ×d1

ar(AQB)=ar(PQB)

Given: CRBQ
We can say that perpendicular distance from C to BQ is equal to perpendicular distance from R to BQ.
Let it be d2
ar(CQB)=12×BQ×d2

ar(RQB)=12×BQ×d2

ar(CQB)=ar(RQB).

ar(AQC)=ar(AQB)+ar(BQC)=ar(PQB)+ar(RQB)=ar(PBR)

ar(AQC)=ar(PBR)

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