An angle is formed when two lines meet at a point.
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A perpendicular bisector is a line that divides a given line segment into halves, and is perpendicular to the line segment. An angle bisector is a line that bisects a given angle.
A perpendicular bisector goes through the median of the line while a perpendicular line can be anywhere on the line as long as it is at a 90 degree angle.
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An obtuse angle is any angle which measures between 90 degrees (that is, a right angle), and 180 degrees (that is, a straight line).