Basic Geometric Ideas |Maths|grade 6
Channel: fathiMATH SUM
Date: 13/09/2020

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This video is an introduction to basic geometry. 
When you start studying geometry, it is important to know and understand some basic concepts. 
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Geometry.....Its the part of mathematics which treats the properties of points, lines, surfaces and solids… Geometry comes from the Greek meaning 'earth measurement' and is the visual study of shapes, sizes and patterns, and how they fit together in space.
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A point in geometry is a location. It has no size i.e. no width, no length and no depth. A point is shown by a dot. A line is defined as a line of points that extends infinitely in two directions.A plane extends infinitely in two dimensions.

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A line is defined by two points and is written as shown below with an arrowhead.

↔
AB

Two lines that meet in a point are called intersecting lines.

A part of a line that has defined endpoints is called a line segment.  A line segment as the segment between A and B above and written as
_
AB




Line: A straight path of points that extends forever in two directions. A line doesn’t have any width or thickness. Arrows are sometimes used to show that the line goes on forever.

Line segment: The set of points on a line between any two points on the line. Basically, it’s just a piece of a line from one point to another that contains those points and all the points between.

Ray: A ray is like half of a line; it starts at an endpoint and extends forever in one direction. You can think of a ray as a ray of light extending from the sun (the endpoint) and shining as far as it can go.

Midpoint: The point halfway (equal distance) between two endpoints on a line segment.

Bisect: To cut something exactly in half, such as when a line, or bisector, cuts another line segment, angle, or polygon into two equal parts.

Intersect: Intersect simply means to cross; that is, when one line or line segment crosses another line or line segment.

Collinear: A set of points that lie on the same line.

Vertical: Lines that run straight up and down.

Horizontal: Lines that run straight across from left to right.

Parallel: Lines that run in the same direction, always remaining the same distance apart. Parallel lines never cross one another.

Perpendicular: When two lines intersect to form a square corner. The intersection of two perpendicular lines forms a right, or 90-degree, angle.

There are some special properties of parallel lines and intersecting lines. The most fundamental aspects of the Geometry emerge from these concepts. Such lines show the relationship between the angles formed.


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