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Given: In quad. PQRS, diagonals PR and QS intersect at T.
To prove: area(PTS) = area(RTQ)
Construction : From P and R, draw perpendiculars to QS, namely PE and RF
Proof : (a) In PET and RTF,
TP = TR (given)
PTE = RTF (vert. opp. angles)
PET = RFT = 90o
(AAS congruence)
area(PTE) = area(RTF) (congruent figures have equal area) ...(1)
And PE = RF (CPCT)
Now, in PSE and RQF,
PES = RFQ (right angle)
PE = RF (proved above)
PS = QR (given)
So, (RHS congruence)
Area (PSE) = area(RQF) ...(2)
Adding (1) and (2), we have:
Area(PTE) + area(PSE) = area(RTF) + area(RQF)
Or, area(PTS) = area(RTQ)
Given: In quad. PQRS, diagonals PR and QS intersect at T.
To prove: area(PTS) = area(RTQ)
Construction : From P and R, draw perpendiculars to QS, namely PE and RF
Proof : (a) In PET and RTF,
TP = TR (given)
PTE = RTF (vert. opp. angles)
PET = RFT = 90o
(AAS congruence)
area(PTE) = area(RTF) (congruent figures have equal area) ...(1)
And PE = RF (CPCT)
Now, in PSE and RQF,
PES = RFQ (right angle)
PE = RF (proved above)
PS = QR (given)
So, (RHS congruence)
Area (PSE) = area(RQF) ...(2)
Adding (1) and (2), we have:
Area(PTE) + area(PSE) = area(RTF) + area(RQF)
Or, area(PTS) = area(RTQ)