Answer:
Asand from a linear pair.
[linear pair]
As is the bisector of
Therefore, [linear pair]
(1)
?(i)
Again,andform a linear pair.
[linear pair]
Asis the bisector of therefore
So, [linear pair]
?(ii)(1)
Inwe have
?(iii)(1/2)
sum of three angles of a triangle is
From Eqs. (i), (ii) and (iii), we have
?(iv)(1/2)
(1)
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