find<A,<B,<C if angle c=80
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angle A=40°
angle B=60°
angle B=60°
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angle b =180-angle of c -40
=60
sum of all angle in triangle=180
angle a = 180- ang b -angc
.=180-60-80
=40
=60
sum of all angle in triangle=180
angle a = 180- ang b -angc
.=180-60-80
=40
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