This picture shows examples of both acute, and obtuse angles. An acute angle can be seen on the black stick's right (our left) arm, where the elbow is the point. An obtuse angle can be seen on his left (our right) arm, where the elbow is also the point.
An acute angle is two lines who meet and form an angle lower than 90 degrees, and an obtuse angle is an angle over 90 degrees.
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