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 $180^{\circ}$. So, $\angle A +\angle B +\angle C =180^{\circ}$ Therefore, sum of the angles of an obtuse triangle is $180^{\circ}$.
So, according to "the angle sum property of the triangle", for any kind of triangle, the sum of its angles is $180^{\circ}$. So, $\angle A +\angle B +\angle C =180^{\circ}$ Therefore, sum of the angles of an obtuse triangle is $180^{\circ}$.
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