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Chapter 4: Quadrilaterals Notes

Home / Class Notes / class 8 / Mathematics / Chapter 4: Quadrilaterals
✓ Free notes class 8 Mathematics 1 study file

About these notes

Class 8 Mathematics Chapter 4 Quadrilaterals notes give clear definitions, labeled diagrams, key properties and formulae for faster revision; the page also points to chapter test and mock tests for CBSE and Bihar Board practice. Main sub-topics: types of quadrilaterals (parallelogram, rectangle, square, rhombus, trapezium), interior angle-sum (sum = 360°), properties and tests for a parallelogram (opposite sides/angles, diagonals), diagonal properties (bisecting, perpendicular in rhombus), and area formulas (parallelogram base × height, rhombus = d1 × d2 ÷ 2, trapezium = ½(sum of parallel sides)×height). For Class 8 students preparing for school term exams, use these notes for revision, important questions, MCQ practice and chapter test prep.

Key points you will learn

  • Class 8 Mathematics Chapter 4 Quadrilaterals
  • Types: parallelogram, rectangle, square, rhombus, trapezium
  • Interior angle-sum of any quadrilateral = 360°
  • Parallelogram rules: opposite sides equal and parallel; opposite angles equal
  • Diagonal properties: diagonals of a parallelogram bisect each other; rhombus diagonals are perpendicular bisectors
  • Area formulas: parallelogram = base × height; rectangle = length × breadth; square = side²
  • Rhombus area = d1 × d2 ÷ 2; trapezium area = ½ (sum of parallel sides) × height
  • Conditions to prove parallelogram: both pairs of opposite sides equal or parallel

What is inside this chapter

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Quadrilaterals - Chapter 4 Notes (Class 8 Maths)

Class 8 Maths Quadrilaterals - Chapter 4 handwritten-style revision notes for CBSE and Bihar Board students.

📥 Open notes

Questions students ask

What is Quadrilaterals chapter in Class 8 Maths?

The chapter explains different quadrilaterals, their defining properties, the angle-sum result (360°), properties of parallelogram/rectangle/rhombus/trapezium, diagonal behaviour and area formulas you must memorise and apply.

Where to find Class 8 Quadrilaterals notes and important questions?

Merit Spring ROH hosts Chapter 4 notes with definitions, labeled diagrams, formulae and revision points; use the site-wide chapter test and mock tests for practicing MCQ and exam-style important questions.

How to remember properties of parallelogram and rhombus for exams?

Make quick flashcards: list equal opposite sides, opposite angles, and diagonal facts; practise sketching small diagrams, solve a few MCQs and attempt chapter test questions to reinforce recall under time pressure.

Difference between a parallelogram and a rectangle?

A rectangle is a special parallelogram with all angles 90°; both have opposite sides equal and parallel, but a rectangle’s diagonals are equal while a general parallelogram’s diagonals need not be equal.

How to solve area problems of trapezium and rhombus?

Apply formulas directly: rhombus area = d1 × d2 ÷ 2, trapezium area = ½ (sum of parallel sides) × height; draw the height clearly, substitute values carefully and practice similar chapter test problems.

← Previous chapter Chapter 3: A Story of Numbers

More Mathematics chapters

Chapter 1: A Square and a Cube Chapter 2: Power Play Chapter 3: A Story of Numbers Chapter 5: Number Play Chapter 6: We Distribute Yet Things Multiply Chapter 7: Proportional Reasoning 1 All chapters →

class 8 — other subjects

ENGLISH Social Science Science