ICSE Ch-21 Solids Ex-21(A) Q. No.7-12 From Selina Concise For ICSE Class 9 Math @jindalmathspoint

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Chapter 21: Solids
Introduction to Solids:

Definition and characteristics of solids.
Differentiating between two-dimensional and three-dimensional shapes.
Types of Solids:

Classifying solids into polyhedra and non-polyhedra.
Examples of polyhedra (cuboid, cube, prism, pyramid) and non-polyhedra (sphere, cylinder, cone).
Faces, Edges, and Vertices:

Understanding the components of a solid: faces, edges, and vertices.
Counting and identifying faces, edges, and vertices in different solids.
Nets of Solids:

Definition of a net.
Representing 3D shapes as nets.
Surface Area of Solids:

Finding the surface area of common solids.
Formulas for surface area of cubes, cuboids, cylinders, cones, and spheres.
Volume of Solids:

Calculating the volume of common solids.
Formulas for volume of cubes, cuboids, cylinders, cones, and spheres.
Conversion of Units:

Converting units of length, area, and volume.
Applications of Solids in Real Life:

Practical applications of solid geometry in various fields.
Solving real-world problems related to solids.
Surface Area and Volume of Composite Solids:

Finding the surface area and volume of composite solids.
Breaking down complex shapes into simpler components.
Summary and Revision:

Recapitulation of key concepts covered in the chapter.

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[allinoneyoutubechannel]

Exam is near don't fear because Jindal sir here

[JasleenKaur-fphf]

I am watching this video before one day of exam

[princefitx]

12 is wrong sir


Area of sheet = Surface area of the tank 
Surface area of the tank = Area of 4 walls of the tank + Area of its base
A=20×8+8×12+20×8+8×12+20×2
A=160+96+160+96+240
A=752m2
Area of sheet = Surface area of the tank 
L×2.5=752

L=300.8 m
Length of the sheet =300.8 m
∴ cost of the sheet =C=300.8×12.50
C=3760

Right one is this

[_jaskiratsingh]

Sir 12th sum is wrong, when we fill the value answer did not came ??
plz tell how to solve it

[BhavyaBajpai-bpel]

Sir do u take fees for online tutions
tell sir

[Kimisious]

Sir please please upload area theorems class 9 ICSE (S Chand).