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Revision Notes

Solids

ICSE · Class 9 · Mathematics

Quick revision notes for Solids — ICSE Class 9 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

42 questions28 flashcards5 concepts

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A comparison illustrating the concept of 1-D (perimeter), 2-D (area), and 3-D (solid/volume) figures with simple geometric shapes.
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Key Topics to Revise

1

1. Core Ideas and Definitions

  • A solid is a three-dimensional figure because it has length, breadth, and height.
  • Volume means the space occupied by a solid.
  • Surface area means the sum of the areas of all the surfaces of a solid; it is also called total surface area.
2

2. Cuboid

  • A cuboid is a rectangular solid with six rectangular faces.
  • A cuboid has length, breadth, and height as distinct dimensions.
  • A cuboid has four equal diagonals: AG, BH, CE, and DF.
3

3. Cube

  • A cube is a rectangular solid in which each face is a square.
  • A cube is a special case of cuboid where l = b = h = a.
  • All edges of a cube are equal.
4

4. Cost of an Article and Related Applications

  • Cost is found by multiplying rate and quantity.
  • Different articles are bought by different measures: petrol by volume, land by area, and cloth by length.
  • The general formula is Cost = Rate × Quantity.

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Full Notes

Key Concepts

Anything which occupies space and hasThe space occupied by a solidThe sum of the areasA cuboid is a rectangular solidA cube is a rectangular solid

Frequently Asked Questions

What are the important topics in Solids for ICSE Class 9 Mathematics?
Solids covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Solids — ICSE Class 9 Mathematics?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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