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THE LEARNING STUDIO · MATHS, MADE CLEAR

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Standard 9Mathematics

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STANDARD 9 PRACTICE0 / 15 topics

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India · Standard 9View curriculum reference
STANDARD 9 · FORMULA TO ANSWER

Area & perimeter

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Mathematics

Triangle area

Explore the area of a triangle, step by step.

Inputs

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RESULT
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Formula & explanation
A = ½ × base × height

Variables & units

Base
m · minimum 0
Perpendicular height
m · minimum 0

Worked example

A base of 12 m and height of 8 m gives 48 m².

Assumptions

Use the perpendicular height, not the sloping side.

heightbase

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.