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Chapter Summary

Area — Chapter Summary

CBSE · Class 8 · Mathematics

Summary of Area for CBSE Class 8 Mathematics. Key concepts: The area of a rectangle equals, A diagonal divides a rectangle and Perimeter is not a valid.

73 questions60 flashcards7 formulas & key relations5 concepts

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Overview

Area is the measure of the space covered by a plane figure. For rectangles, the area is found by counting unit squares, and this gives the formula Area of a rectangle = length × width. A 7 cm × 4 cm rectangle contains 28 unit squares, while an 8 cm × 3 cm rectangle contains 24 unit squares, so a lar

Key Concepts

The area of a rectangle equals

The area of a rectangle equals length × width. This comes from counting how many unit squares fit inside it. A rectangle of 7 cm by 4 cm has area 28 c

A diagonal divides a rectangle into

A diagonal divides a rectangle into two congruent triangles. Each triangle has half the area of the rectangle. In identical rectangles, triangles such

Perimeter is not a valid measure

Perimeter is not a valid measure of area. Two regions can have the same perimeter but different areas, and one region can even have a larger perimeter

The area of a triangle

The area of a triangle is 1/2 × base × height. This formula works for all triangles, including triangles that cannot be enclosed by a rectangle with t

The same triangle can have its

The same triangle can have its area written in more than one way. For example, Area(ΔABC) = 1/2 × AX × BC = 15/2 sq. units and also Area(ΔABC) = 1/2 ×

Learning Objectives

  • Measure area by counting unit squares and using formulas
  • Find the area of rectangles and squares
  • Use the triangle area formula in different situations
  • Compare area and perimeter correctly
  • Find the area of a parallelogram by dissection

Frequently Asked Questions

What are the important topics in Area for CBSE Class 8 Mathematics?
Key topics in Area include Area of rectangles and squares, Area of triangles, Area of any polygon, Area of a parallelogram. Study these first, then practise questions on each for Class 8 exams.
How should I revise Area for Class 8 exams?
Learn the core ideas first, then work through the 73 practice questions on Area. Revise 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.

More resources for Area

All CBSE Class 8 Mathematics Chapter Summary

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