The sides AB and AC of 
ABC have been produced to D and E respectively. The bisectors of 
and 
meet at O. If 
=40° find 
.
70°
Given, bisector of 
and 
meet at O.
If OB and OC are the bisector of 
and 
meet at point O .
Then,
= 90°- 
⇒
= 90°- 
40°
⇒
= 70°
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