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If triangle has one obtuse angle other two angles are acute. Since, sum of angles of triangle is 180.
Acute angles are greater than 0 but less than 90 degrees Obtuse angles are greater than 90 but less than 180 degrees Reflex angles are greater than 180 degrees but less than 360 degrees
Acute angles (less than 90 degrees) Obtuse angles (greater than 90 degrees) Right angles ( equal to 90 degrees)
An Angle between 90 degrees and 180 degrees is OBTUSE. NB An angle less than 90 degrees is ACUTE An angles between 180 degrees and 360 degrees is REFLEX.
Every obtuse angle. There are an infinite number of them.