Answer:
Given Two and with common base andand
To prove and
Proof In and we have
[given]
[given]
[common]
(1)
[by SSS congruence]
[by CPCT]
[by CPCT](1/2)
Now, in and
[given]
[proved above]
[common]
[by SAS congruence]
[by CPCT]
[by CPCT]?(i)(1/2)
Also, [linear pair]..(ii)
From Eqs. (i) and (ii), we have
(1/2)
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