Answer :

For a proper triangle the sum of all interior or internal angles should be equal to 180°.

Now let us take each option separately,


For option A:


110° + 40° = 140° and so the third angle is 40°.


For Option B:


70° + 115° = 185° which is greater than 180° which is not correct.


For option C:


135° + 45° = 180°. Here the sum is already 180° without considering the third angle which is incorrect.


For option D:


90° + 90° = 180°. Here the sum is already 180° without considering the third angle which is incorrect.


So it is clearly observed that only option A is satisfying the angle condition of the triangle.


So the correct answer is A.

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