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A long narrow mark or brand

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line

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"Extends in both directions without end(infinitely). One end makes it a ray, and two ends make a line segment".

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When a line moves from left to right in a straight direction, it is a horizontal line.

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When a line runs from top to bottom in a straight direction, it is a vertical line.

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When two straight lines don’t meet or touch at any point, even at infinity then they are parallel to each other.

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When two lines meet or intersect at an angle of 90 degrees or at a right angle, then they are perpendicular to each other.

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The Tangent is a straight line which just touches the curve at a given point. The normal is a straight line which is perpendicular to the tangent. To calculate the equations of these lines we shall make use of the fact that the equation of a straight line passing through the point with coordinates (x₁, y₁) and having gradient m is given by

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A line in the plane is a secant line to a circle if it meets the circle in exactly two points. It is also equivalent to the average rate of change, or simply the slope between two points. The average rate of change of a function between two points and the slope between two points are the same thing.

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A set of all points between and extending beyond two points .

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A mark or stroke long in proportion to its breadth, made with a pen, pencil, tool ,on a surface a line down the middle of the page.

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The set of all points between and beyond two points. A line is infinite in length.