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Solution:
Given ..................
To prove : ΔBAP ≅ ΔCAP
: BP =CP
Proof :
∠APC + ∠CPD = 180 (Linear pair)
∠CPD = 180 - ∠APC .......(i)
∠APB + ∠BPD = 180 (Linear pair)
∠BPD = 180 - ∠APB .......(ii)
Since ∠CPD = ∠BPD (Given) .......(iii)
From i , ii and iii
∠APC = ∠APB
Now ∠ACP = ∠ABP ( They both are the part of Triangles whose 2 other angles are equal hence by Angle Sum property they are also equal )
In Δ BAP and Δ CAP
∠BAP = ∠CAP ( They are bisected )
∠APB = ∠APC ( proved above )
∠ABP = ∠ACP ( proved above )
∴ ΔBAP ≅ ΔCAP ( AAA congruence rule)
and
BP = CP ( CPCT)
Hence Proved !