posted by MathPerson .
Measure of two angles of a tringle are 28 and 58. Classify triangle by it's angle.
An acute triangle has all acute angles (less than 90 degrees)
An obtuse triangle has one obtuse angle, more than 90 deg. and less than 180 deg
28 + 58 = 86
180 - 86 = 94
therefore, this is an obtuse triangle