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ख) \( \triangle \mathrm{ABC} \) मा \( \angle \mathrm{BAC}=45^{\circ}, \angle \mathrm{ABC}=2 \angle \mathrm{BCA} \) भए, (अ) \( \angle \mathrm{ABC} \) र \( \angle \mathrm{BCA} \) को नाप पत्ता लगाउनुहोस् । (अ) \( \triangle \mathrm{ABC} \) कस्तो प्रकारको त्रिभुज हो ? कारणसहित

Ask by Cervantes Chan. in Nepal
Feb 12,2025

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∠ABC = 90° र ∠BCA = 45°। त्रिभुज ABC एक समकोण समद्विबाहु त्रिभुज हो।

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तपाईंको प्रश्नको समाधान गर्नका लागि, सबै कोणहरूको योगफल 180° हुने गुण प्रयोग गर्नुपर्दछ। \( \angle BAC = 45° \) हो र \( \angle ABC = 2 \angle BCA \) भनिएको छ। यदि \( \angle BCA = x \) मान्ने हो भने, \( \angle ABC = 2x \) हुनेछ। अब, \( 45° + 2x + x = 180° \) यसलाई सरल बनाउँदा, \( 45° + 3x = 180° \) र त्यसको विपरीत प्रकारले \( 3x = 135° \) पाउँछौं, जसबाट \( x = 45° \) हुनेछ। त्यसपछि \( \angle ABC = 2x = 90° \) हुन्छ। सो, कोणहरूको मान यसप्रकार छ: \( \angle ABC = 90° \) र \( \angle BCA = 45° \)। अब, \( \triangle ABC \) एक समकोण त्रिभुज (right triangle) हो। यसको कारण \( \angle ABC \)को मान 90° रहेकोले यसलाई समकोण त्रिभुज भन्न सकिन्छ। साथै, यसमा दुई समान कोणहरू (45° र 45°) पनि रहेकोले यो समकोण (isosceles right triangle) त्रिभुजको विशेषता हो।

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