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Standard 3Mathematics

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STANDARD 9 PRACTICE0 / 15 topics

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India · Standard 3View curriculum reference
STANDARD 3 · FORMULA TO ANSWER

Area & perimeter

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Mathematics

Rectangle area

Calculate the area of a rectangle from its length and width. See the multiplication formula, input units and a worked example.

Inputs

Use the units shown
RESULT
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Formula & explanation
A = length × width

Variables & units

Length
cm · minimum 0, maximum 1000000000
Width
cm · minimum 0, maximum 1000000000

Worked example

An 8 cm by 5 cm rectangle has an area of 40 cm².

Assumptions

Keep both dimensions in centimetres; area is measured in square centimetres.

Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.

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NCERT/CBSE references. Topic selections are curated practice; board, edition and year requirements vary. These are suggested topic collections, including related practice and enrichment; they are not exhaustive syllabus mappings, university endorsements, or complete exercise solutions. All public calculators stay available to every learner.

Books and source materials
Clear sources. Original explanations.

Source review: 2026-11-02. Book titles follow the NCERT publication list. Class 9 topic alignment uses the CBSE 2026–27 curriculum. Publisher sites can update editions and may occasionally be unavailable.