An angle is the difference in direction of two lines. Alternate interior angles and supplementary angles are specific types of angles formed by intersecting lines.
An angle is the difference in direction of two lines which, if extended, would meet. Angles are measured by using the meeting point as the center of a circle and finding the fraction of the circle, or number of degrees of the circle, included between the lines.
Some angles formed by a line intersecting two other lines are called alternate interior angles.
Two angles having the same vertex and one side in common, while the sides not common form a straight line, are called supplementary angles.
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