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  1. If each angle of a triangle is less than the sum of the other two, then the triangle is
    1. obtuse angled
    2. right angled
    3. acute angled
    4. equilateral
Correct Option: C

According to question ,

In right angled ∆ ABC,
B² = A² + C²

In an equilateral triangle ABC,

∠B =
∠A + ∠C
2


In obtuse angled triangle,
∠B > ∠A + ∠C

In acute angled triangle ABC,
∠A < ∠B + ∠C
∠B < ∠A + ∠C
Hence , correct answer is option C .



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