Chapter 11 · Class 8 ICSE · Formula Sheet

Polygons Formulas — Class 8 ICSE

Explore interior and exterior angles of regular and irregular polygons.

Key Formulas

Angle Sum (Quadrilateral)

360°

Angle Sum (Polygon)

(n-2) \times 180°

Each Angle (Regular Polygon)

\dfrac{(n-2) \times 180°}{n}

Exterior Angle Sum

360°

Each Exterior Angle

\dfrac{360°}{n}

Worked Examples

1Using: Application

Apply the key formula from this topic to a sample problem.

Step 1: Identify the formula.

Step 2: Substitute the values.

Step 3: Simplify to get the answer.

Answer: See solution above

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More Class 8 ICSE Formulas

Rational Numbers Exponents & Powers Squares & Square Roots Cubes & Cube Roots Algebraic Expressions Factorization

Frequently Asked Questions

How many formulas are in Class 8 ICSE Polygons?+

There are 5 formulas in the Polygons chapter for Class 8 ICSE. Each formula is essential for solving problems in this topic.

How to remember Polygons formulas easily?+

Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.

Are these Polygons formulas enough for exams?+

Yes, these formulas cover the complete ICSE Class 8 syllabus for Polygons. Practice applying them to different types of questions for full exam readiness.

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SparkEd Maths provides free formula sheets for Class 1-10 across 7 education boards. All formulas are aligned to the 2025-26 syllabus.