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A line is a straight one-dimensional figure having no thickness and extending infinitely in both directions.

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An Interior Angle is an angle inside a shape

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The Exterior Angle is the angle between any side of a shape, and a line extended from the next side.

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The distance between two points is the length of a straight line segment that links them

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Congruent Angles have the same angle (in degrees or radians). That is all. These angles are congruent. They don't have to point in the same direction. They don't have to be on similar sized lines.

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In geometry, an angle can be defined as the figure formed by two rays meeting at a common end point.

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Two angles are Adjacent when they have a common side and a common vertex (corner point) and don't overlap.

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Acute angles measure less than 90 degrees.