Question
Write the sum of the angles of an obtuse triangle.
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Answer
In the given problem, $\triangle\text{ABC}$ is an obtuse triangle, with$\angle\text{B}$ as the obtuse angle. 
So, according to "the angle sum property of the triangle", for any kind of triangle, the sum of its angles is 180°. So,$\angle\text{A}+\angle\text{B}+\angle\text{C}=180^\circ$
Therefore, sum of the angles of an obtuse triangle is 180º.
So, according to "the angle sum property of the triangle", for any kind of triangle, the sum of its angles is 180°. So,$\angle\text{A}+\angle\text{B}+\angle\text{C}=180^\circ$Therefore, sum of the angles of an obtuse triangle is 180º.
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