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