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Basic Geometry * * Triangle, Quadrilateral, Rectangle, Square and Circle are some of the common plane figures. P

* Basic Geometry *

Point: A point has no length, breadth or thickness.

Line: A line has no fixed length and no breadth or thickness.

Line Segment: A straight line with two end points is called a line segment.

Ray: A line segment extended endlessly in one direction is called a ray.

Defferent Types of Lines

Horizontal line:
Vertical lines:
Slanting lines:
Parallel lines:
Wavy lines:
Curved lines:
Intersecting lines:

Plane figures:
Triangle, Quadrilateral, Rectangle, Square and Circle are some of the common plane figures. Plane figures has two things- 
sides and vertices.

Vertex: the meeting point of two line segments is called vertex.

Triangle: A simple closed plane figure with is surrounded by three line segments is called a triangle.

Quadrilateral: a figure bounded by four line segments is called a quadrilateral.
( A quadrilateral has 4 side, 4 vertices, 4 angles.)

Rectangle: A quadrilateral in which opposite sides are equal to each other and each angle is equal to to 90 degree is called a rectangle.
( All angles of a rectangle are also equal.)

Square: A rectangle having all side of the same length is called a square.
( All angles of a square are equal to each other.)

Circle: A circle is a closed plane figure. it has no vertex. It is formed by curved line. The mid point inside a circle is called the centre of the circle. 
( It has no side and no vertices.)

Solid figures:
An object that occupies space is called a solid.
The outside of a solid is called its surface.

Cube: In a cube all sides are equal in length.
A cube has: 
12 sides (edges), 
6 faces, 
8 vertices.

Cuboid: In a cuboid opposite sides are equal in length.
A cuboid has:
12 sides,
6 faces and opposite surface are equal in shapes and sizes.
8 vertices.

Cylinder: A cylinder has two plane surfaces and one curved face.
It has two edges but no vertex.
Con: A con has one plane face and one curved face.
It has one vertex.

Sphere: A sphere has only one curved face.
It does not have any side or vertex.
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