Page 125 - Revised Maths Wisdom Class - 3

Geometry 123

COGNITIVE

MAP

Geometry Solid Shapes

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Elementary Things Shapes and Properties CUBE

1. POINT TRIANGLE A Vertex
A Point It has: Vertex
Denoted by a point (dot) (i) 3 sides Side Face
(ii) 3 vertices B C Edge
2. LINE SEGMENT 6 faces
P Q SQUARE 12 edges
D C
denoted by PQ 8 vertices
Side Vertex
(i) has two points A B Here, every face is square
(ii) has fi nite length
(i) It has four sides
3. LINE AB = BC = CD = DA
P Q (ii) It has four vertices CUBOID
denoted by PQ RECTANGLE Vertex
(i) has two points A Vertex
(ii) has infi nite length Side B Face
Edge
4. RAY D C
P Q (i) It has four vertices 6 faces
denoted by PQ (ii) It has four sides 12 edges
(i) has two points, i.e. AB = CD and AD = BC 8 vertices
one is fi xed CIRCLE Here, every face is rectangle
(ii) has infi nite length
Here Radius
OA radius B O A CONE
AB diameter Centre
O Centre Vertex
Symmetry Diameter = 2 × radius Curved Face
Plane Face Edge

Line of When a given fi gure can be divided 2 faces
symmetry into two equal halves then the fi gure 1 edge

is called symmetrical. 1 vertex