Math, asked by manjubora9076, 11 months ago

सिद्ध कीजिए कि त्रिभुज के तीनों कोणों का योगफल दो समकोण अर्थात 180° होता है।

Answers

Answered by amitnrw
3

त्रिभुज के तीनों कोणों का योगफल  = 180°

Step-by-step explanation:

माना  त्रिभुज ABC

बिंदु  A से गुजरने वाले BC के समानांतर एक रेखा PQ खींचें

P A Q - रेखा = 180°

PQ ║ BC

=> ∠PAB = ∠CBA = ∠B

∠QAC = ∠BCA = ∠C

∠PAB + ∠BAC + ∠QAC = 180°  सीधी रेखा

=> ∠PAB + ∠A + ∠QAC = 180°

=> ∠B + ∠A + ∠C = 180°

=> ∠A + ∠B + ∠C = 180°

त्रिभुज के तीनों कोणों का योगफल  = 180°

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