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If you look at the front view of a plane you can see the angle that the wings make. If the wing tips are higher than where the wings connect to the plane it is called a dihedral angle, most large airplanes are designed this way. This angle is used to increase roll stability. (This means that if the plane encounters a disturbance is can more easily return to its original position.) Anhedral angles are when the wing tips are lower than the wing base and are used on smaller planes like fighter planes. This angle increases the roll performance.