basic geometrical ideas class vi
TRANSCRIPT
This is a PowerPointPresentation based
On basic geometrical
ideas
CLASS VI
What is Geometry????!!!??
Geometry is the branch of mathematics which deals with the properties and relations of lines , angles , surfaces and solids. Just as math's deals with numbers, geometry deals with figures , points and lines…..
A point is usually represented by a small dot and is name by a single capital letter of alphabet<see fig.1>.It has no magnitude i.e. has no length, breadth or thickness. Fig.1
A line is straight and extends indefinitely on both sides<see fig.1>.
Fig.1
Line-
Line segment-A part of a line is called a line segment.<see fig.2>.
Fig.2A B
A ray is a part of a line, which has one end point, and extends indefinitely on the other side<see fig.1>A
A plane is a flat surface that extends indefinitely in all directions. The surface of the wall is an example of a plane.<see fig.1>.
Fig.1
An angle is formed by two rays starting from the same initial point. The initial point O is called the vertex. Rays OA and OB are called the arms of the angle.
O
A
B
A
CB
A triangle is a three sided closed figure, formed by three line segments intersect in pairs. A,B and C are known as the vertices (singular vertices) of the triangle. A triangle has:-
1.Three sides AB,BC and CA.
2.Three angles <A,<B and <C.
3.Three vertices A, B & C
INTERIOR
EXTERIOR
NO
D
ALTITUDE
A quadrilateral is a four sided figure. ’ Quadri ’ means four, and ‘ lateral ‘ means sides. If A,B,C and D are four points in a plane such that no three of them are collinear and the line segments AB,BC,CD and DA do not intersect except at their end-points, then the figure formed by these four line segments is called the quadrilateral ABCD.A D
B C
ADJACENT SIDES
BC & AD are opposite sides.
. o
A circles a set of points on a plane which are at the same distance from a fixed point called centre (O).B A
OB=RADIUSAB=DIAMETER< 2 X RADIUS >
INTERIOR
EXTERIOR
CHORDC D
E
CED is the minor arc and CSD is The major arc.
S
LEARNING OUTCOMES
Students will be able to*understand the concept of a point, line, line-segment, ray, plane, angle, triangle, quadrilateral, circle.*apply the knowledge in different situations.
Made by ayush dabraOf Class 6
Under guidance ofR.K katiyar sir