please solve it ............................
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Answered by
4
Answer:
Step-by-step explanation:
As we know that a+b+c=180°
so B+C=180-A
orB/2 +C+C/2 = 90-(A/2)......(i)
now think in triangle BOC
we have three angle,OBC,BOC,OCB
OBC=(B/2)
OCB=(C/2)
Let BOC=X
so,x+(B/2)+(c/2)=180°
from equation...(i)
x+90°-A/2
x=90°+A/2.............PROVED(!!!!)
Answered by
1
Answer:
ab try karo
Step-by-step explanation:
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