Question

| B, চমু প্রশ্নাবলী
মূল্যাংক ঃ 2/3
উত্তল 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]​

Answer 1

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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