It depends on the angle not all obtuse angles measure the same. To measure an angle you use a protractor.
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Not every triangle has to have an obtuse angle.
An angle between 90 and 180 degrees.
Any obtuse angle has.
-- No right triangle, acute triangle, or equilateral triangle has an obtuse angle in it. -- If a triangle has an obtuse angle in it, then it's called an obtuse triangle. -- No triangle can have more than one obtuse angle in it .
Yes. Every triangle with an obtuse angle must have two acute angles.