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| B, চমু প্রশ্নাবলীমূল্যাংক ঃ 2/3উত্তল দাপােন এখনৰ সন্মুখত 10 ছে.মি. দূৰত্বত লক্ষ্য বস্তু |এটা ৰখা হৈছে। দাপােনৰ পিছফালে 5 ছে.মি. দূৰত্বত |প্রতিবিম্ব গঠন হৈছে। উত্তল দাপােনৰ ফ'কাছ দৈর্ঘ্য উলিওৱা।।[HSLC' 15] |
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Answer» Answer: The FIRST required angle = 50° The second required angle = 30° The third required angle = 100° Given: The angles of a triangle are in the ratio of 3:5:10. Need to find: The first required angle = ? The second required angle = ? The third required angle = ? Solution: LET, The first required angle be 5y°. The second required angle be 3Y°. The third required angle be 10y°. As we KNOW that: Sum of all angles of triangle is equal to 180 degree. ★ Now, ATQ: ➦ 5y + 3y + 10y = 180 ➦ 8y + 10y = 180 ➦ 18y = 180 ➦ y = 180/18 ➦ y = 10 Therefore: The first required angle = 5 × 10 The first required angle = 50° The second required angle = 3 × 10 The second required angle = 30° The third required angle = 10 × 10 The third required angle = 100° ━━━━━━━━━━━━━━━━━━━━━━━ |
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