find c given that a =b=c
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a+b+c=180degree
3a=180 degree
a=60 degree =b=c
3a=180 degree
a=60 degree =b=c
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these are on straight line so there is linear pair
and a=b=c
so a+b+c=180°(linear pair)
c+c+c=180°
3c=180°
c=180°/3
c=60°
and a=b=c
so a+b+c=180°(linear pair)
c+c+c=180°
3c=180°
c=180°/3
c=60°
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