A triangle can be constructed by taking two of its angles which are

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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
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  1. 90°, 90°
  2. 135°, 45°
  3. 70°, 115°
  4. 110°, 45°

Answer (Detailed Solution Below)

Option 4 : 110°, 45°
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Detailed Solution

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Concept used:

In a triangle, the sum of all three interior angles must be equal to 180 degrees.

Calculation:

1. 90°, 90°: If we choose two 90-degree angles, the sum of these two angles is 90° + 90° = 180°. 

This leaves no room for a third angle, so a triangle cannot be constructed with these two angles.

2. 135°, 45°: The sum of these two angles is 135° + 45° = 180°. 

This leaves no room for a third angle, so a triangle cannot be constructed with these two angles.

3. 70°, 115°: The sum of these two angles is 70° + 115° = 185°, which is greater than 180°. 

Therefore, a triangle cannot be constructed with these two angles.

4. 110°, 45°: The sum of these two angles is 110° + 45° = 155°, which is less than 180°. 

∴ A triangle can be constructed with these two angles :  110°, 45°

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