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prove sss congurence rule Related: Facts That Matter,Triangles Mathem...
SSS congruence criterion:
Two triangles are congruent if the three sides of one triangle are equal to the corresponding three sides of the other triangle
Given: ΔPQR and ΔXYZ are such that PQ = XY, QR = YZ and PR = XZ.
To prove: ΔPQR ΔXYZ
Construction: Draw YW such that ∠ZYW = ∠PQR and WY = PQ. Join XW and WZ.
Proof: In  ΔPQR and  ΔWYZ
QR = YZ    (Given)
∠PQR = ∠ZYW  (Construction)
PQ = YW  (Construction)
∴ΔPQR ΔWYZ     (SAS congruence criterion)
⇒∠P  =∠W and PR = WZ      (CPCT)
PQ = XY and PQ = XW
∴ XY = YW
Similarly, XZ = WZ
In ΔXYW, XY = YW
⇒ ∠YWX = ∠YXW         (In a triangle, equal sides have equal angles opposite to them)
Similarly, ∠ZWX = ∠ZXW
∴ ∠YWX + ∠ZWX = ∠YXW + ∠ZXW
⇒ ∠W = ∠X
Now, ∠W = ∠P
∴ ∠P = ∠X
In ΔPQR and ΔXYZ ,
PQ = XY
∠P = ∠X
PR = XZ
∴ ΔPQR ΔXYZ      
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