Area of Two-Dimensional Figures

JCERT · Class 8 · Chapter 14 · Area of Two-Dimensional Figures. Syllabus-aligned topic notes and teaching examples, not a complete textbook answer key.

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Why This Chapter Matters

JCERT · Class 8 · Chapter 14 · Area of Two-Dimensional Figures. Syllabus-aligned topic notes and teaching examples, not a complete textbook answer key.

Before You Begin (Prerequisites)

Revise the relevant ideas from the previous grade.

What You Will Learn (Core Objectives)

Revise areas of rectangles, squares, parallelograms, triangles and circles. Use perpendicular height for trapeziums and diagonals for rhombuses. Divide a general polygon into nonoverlapping familiar regions.

Chapter Roadmap & Progression

1 Syllabus, textbook and notes alignm...

2 Concept and method

3 Check and common pitfall

Complete Concept Guide (100% Curriculum Coverage)

Syllabus, textbook and notes alignment

JCERT · Regular schools (Non-SOE) · Class 8 · Chapter 14 — Area of Two-Dimensional Figures
Official syllabus pages 206–221. Official syllabus · Prescribed Hindi book (17 chapters).

These topic notes and teaching examples are not a complete answer key to every textbook exercise. English notes use this same JCERT chapter order; a matching English textbook PDF has not been verified.

Source issue: this chapter’s original DIKSHA PDF is damaged. These are syllabus-aligned topic notes; complete source-question coverage and solutions have not been verified.

Concept and method

Revise areas of rectangles, squares, parallelograms, triangles and circles. Use perpendicular height for trapeziums and diagonals for rhombuses. Divide a general polygon into nonoverlapping familiar regions.

Check and common pitfall

Height is the perpendicular distance between parallel sides, not a sloping side.

Key Formulas, Identities & Theorems

Key relationships

Trapezium:A=(a+b)h/2; rhombus:A=d1d2/2

Observe formula conditions and units.

Conceptual Solved Examples & Case Studies

Example 1

A trapezium has parallel sides8cm and14cm and height5cm. Find its area.

Step-by-Step Solution:

A=(8+14)×5/2=55cm²

Height is the perpendicular distance between parallel sides, not a sloping side.

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