all angles greater then 90o are called obtuse angle
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A 155 degree angle is an angle that measures 155 degrees. It falls between 90 and 180 degrees, which means it's an obtuse angle. So, if you're ever in a situation where you need to identify a 155 degree angle, now you know it's just a fancy way of saying "more than a right angle, but less than a straight angle."
An obtuse angle.
reflex angle
It's larger than 90 degrees, so we call it an "obtuse angle."
reflex angle