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    📚 Class 9 Formula Revision

    Amit Thakur | INSTALEARN

    Number Systems (Laws of Exponents)

    Revise the rules for multiplying and dividing powers.

    Number Systems Formulas
    Polynomials (Algebraic Identities)

    Memorize all 5 standard identities for factorisation.

    Polynomial Identities
    Heron's Formula

    Formula for calculating the area of a triangle given all three sides.

    Heron's Formula
    ⚛ Atoms & Molecules (Table of Ions)

    Memorize the symbols and valencies for Cations (+) and Anions (-).

    Table of Ions

    Note for Students: Click on any formula image to enlarge it for better reading.

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    March 19, 2026

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