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| Basic Geometrical Concepts |
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| Point |
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| It is an exact location. It is a fine dot which has neither length nor breadth nor thickness but has position i.e., it has no magnitude. It is denoted by capital letters A, B, C, O etc. |
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| Line segment |
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The straight path joining two points A and B is called a line segment  |
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| Ray |
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A line segment which can be extended in only one direction is called a  |
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| Line |
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When a line segment is extended indefinitely in both directions it forms  |
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| Collinear points |
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| If two or more points lie on the same line, then they are called collinear points. |
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| Non-collinear points |
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| Points which do not lie on the same line are called as non-collinear points. |
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| Example: |
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| E, F, G, H, I |
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| Intersecting lines |
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| Two lines having a common point are called intersecting lines. The common point is known as the point of intersection. |
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| Concurrent lines |
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| If two or more lines intersect at the same point, then they are known as concurrent lines. |
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| Plane |
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| A plane is a surface such that every point of the line joining any two points on it, lies on it. |
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| Example: |
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| Surface of a smooth wall, surface of a paper. |
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Lines Angles and Triangles |
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