This is obtuse because the angle to the biggest side is more than 90 degrees. The correct answer is option A.
What is an obtuse angle?
The angle made by the two lines which are greater than 90 degrees angle then it is called an obtuse angle.
As we can see that the one angle in the given triangle is greater than 90 degrees so the triangle is an obtuse-angled triangle.
It can't be isosceles because that would require 2 sides to be equal, if it were acute all the angles would have to be less than 90 degrees.
Therefore it is obtuse because the angle to the biggest side is more than 90 degrees. The correct answer is option A.
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