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यदि किसी त्रिभुज की कोणों में अनुपात 3 : 4 : 5 हो, तो कोणों के ज्ञात कीजिए।

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त्रिभुज के तीनों कोणों का अनुपात 3 : 4 : 5

माना पहला कोण = 3x

दूसरा कोण = 4x

तथा तीसरा कोण = 5x

3x + 4x + 5x = 180°

12x = 180°

x = 15

अतः पहला कोण = 3 x 15 = 45°

दूसरा कोण = 4 x 15 = 60°

तथा तीसरा कोण = 5 x 15 = 75°

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