A angle that is larger than 90 degrees
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Acute, obtuse, and right.
A traditional kite shape (a point at the top, then widest about 1/3 of the way down, then tapering to another point at the bottom) has one, two or three obtuse (>90 degree) angles. The two angles at the widest point, about 1/3 of the way from the top, are generally obtuse, but don't have to be. The bottom angle is almost never obtuse. The top angle is sometimes obtuse. So if the top angle is obtuse but the side angles are not, a kite shape has one obtuse angle. If the top angle is not, but the side angles are, it has two obtuse angles. If the top and side angles are obtuse it has three.
The converse statement is that if the angle is an obtuse angle then it measures more than 90 degrees. Does not add much by way of information but there you go!
An obtuse triangle has one angle greater than 90 degrees and a right triangle has one angle exactly 90 degrees.
A right angle sits at 90o, which is right in the middle. Anything less than 90o, or to the left on the protractor are acute angles. Anything to the right, or bigger than 90o, would be considered an obtuse angle. A good way to remember this is that an acute angle is "a cute little angle."