Angle an angle with a measure greater than 90º but less than 180º. 2. acute angle a segment, ray or line which divides the angle into two angles of equal measure. 3. bisector of an angle an angle whose measure is greater than zero and less than 90º. 4. right angle lines that intersect to form right angles. 5. obtuse angle formed by two rays that have a common endpoint. 6. perpendicular lines an angle whose measure equals 90º.

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.