If the angles of a triangle are in the ratio of 1 ∶ 2  3, what is the type of such triangle?

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SSC CGL 2022 Tier-I Official Paper (Held On : 07 Dec 2022 Shift 1)
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  1. Isosceles triangle
  2. Equilateral triangle
  3. Right-angle triangle
  4. Obtuse- angle triangle

Answer (Detailed Solution Below)

Option 3 : Right-angle triangle
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Detailed Solution

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Given:

Ratio of the angles = 1 : 2 : 3

Concept used:

The sum of all angles of the triangle is 180°

Calculations:

Let 1st angle be x

⇒ 2nd angle = 2x

⇒ 3rd angle = 3x

Now,

⇒Sum of angles = 180

⇒ x + 2x + 3x = 180

⇒ 6x = 180

⇒ x = 30°

Angles will be

⇒ 1st angle = x = 30°

⇒ 2nd angle = 2x = 2 \(\times\) 30 = 60°

⇒ 3rd angle = 3x = 3 \(\times\) 30 = 90°

Here, One angle is 90, so the triangle is right angled triangle

⇒ Hence, The triangle is right angle triangle

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