सिद्ध कीजिए कि त्रिभुज के तीनों अंतः कोणों का योग 180 अंश होता है
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in traingle abc
we know that all side of equilateral trangle is 60 degree
angle A + angle B + angle C = ?
60 degree + 60 degree + 60 degree = 180 degree
proved
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