Page 164 - MathGPT_V1.0_C4

E:\Working\Brother_Education\Preparatory_Stage_Maths-4\Open_Files\Chap-08
\\November 1, 2023 12:57 PM Bharat Arora P-2 Reader _________________________ Date: ___________________

Encapsulate
math
GeometRy

Basic Geometrical Ideas Angle

Point: A small dot which represents the position or location is called a point. When two rays or straight lines meet
A or intersect at a point, they form an
angle, as shown below.
Point A
Line: A path which can extend in both directions indefinitely is called a line. A
A B Arm

Line segment: A line segment is a part of a line. It has two end points.
A B
Angle
Ray: A part of a line extending only in one direction is called a ray.
A B O B
Vertex
Arm

types of Lines open and Closed Figures
open figures
Vertical
Horizontal line Slanting
line line
Closed figures
Intersecting Lines Parallel Lines Perpendicular Lines

l m p C
q Polygons
O
D A B

Solids Circle

Basic Solids Centre of circle
O is the centre. The distance between point O.
and any point on the boundary of the circle is
equal.
Diameter
O The diameter AB is the distance across a
Cube Cuboid Cone Cylinder Sphere B circle through its centre.
A
Radius
The radius OR is the distance from the
centre to any point on the circle.
Circumference
R The circumference is the distance around
Cube Cuboid Cone Cylinder Sphere
the circle.
Nets of Solid Perspective of Shapes

Cube Cuboid Plan View Front View Side View

162 Mathematics-4