Equilateral Triangle Calculator - Find Area, Side, Height

Calculate the area, side length, height, and perimeter of an equilateral triangle from any known value. Includes formulas and a step-by-step example.

Full original guide (expanded)

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

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Formula (extracted LaTeX)

\[','\]

','

Formula (extracted LaTeX)

\[', '\]

', '

Formula (extracted LaTeX)

\[A = \frac{a^2 \sqrt{3}}{4}\]

A = \frac{a^2 \sqrt{3}}{4}

Formula (extracted LaTeX)

\[h = \frac{a \sqrt{3}}{2}\]

h = \frac{a \sqrt{3}}{2}

Formula (extracted LaTeX)

\[P = 3a\]

P = 3a

Formula (extracted text)

$ A = \frac{a^2 \sqrt{3}}{4} $

Formula (extracted text)

$ h = \frac{a \sqrt{3}}{2} $

Formula (extracted text)

$ a = \sqrt{\frac{4A}{\sqrt{3}}} $

Formula (extracted text)

$ a = \frac{2h}{\sqrt{3}} $

Variables and units

No variables provided in audit spec.

Sources (authoritative):

Home — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Math & Conversions — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/math-conversions
Geometry — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/subcategories/geometry
Triangle Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/triangle-calculator
Circle Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/circle-calculator
Area Calculator – Compute Area of Common Shapes (with Steps & Formulas) — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/area
Volume Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/volume
Surface Area Calculator — Formulas, Steps, and Examples — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/surface-area

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

, ', svg: { fontCache: 'global' } };

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[', '\\]

', '\

Formula (extracted LaTeX)

\[','\]

','

Formula (extracted LaTeX)

\[', '\]

', '

Formula (extracted LaTeX)

\[A = \frac{a^2 \sqrt{3}}{4}\]

A = \frac{a^2 \sqrt{3}}{4}

Formula (extracted LaTeX)

\[h = \frac{a \sqrt{3}}{2}\]

h = \frac{a \sqrt{3}}{2}

Formula (extracted LaTeX)

\[P = 3a\]

P = 3a

Formula (extracted text)

$ A = \frac{a^2 \sqrt{3}}{4} $

Formula (extracted text)

$ h = \frac{a \sqrt{3}}{2} $

Formula (extracted text)

$ a = \sqrt{\frac{4A}{\sqrt{3}}} $

Formula (extracted text)

$ a = \frac{2h}{\sqrt{3}} $

Variables and units

No variables provided in audit spec.

Sources (authoritative):

Home — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Math & Conversions — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/math-conversions
Geometry — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/subcategories/geometry
Triangle Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/triangle-calculator
Circle Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/circle-calculator
Area Calculator – Compute Area of Common Shapes (with Steps & Formulas) — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/area
Volume Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/volume
Surface Area Calculator — Formulas, Steps, and Examples — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/surface-area

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

]], displayMath: [['\\[','\\]']] }, svg: { fontCache: 'global' } };, svg: { fontCache: 'global' } };

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[', '\\]

', '\

Formula (extracted LaTeX)

\[','\]

','

Formula (extracted LaTeX)

\[', '\]

', '

Formula (extracted LaTeX)

\[A = \frac{a^2 \sqrt{3}}{4}\]

A = \frac{a^2 \sqrt{3}}{4}

Formula (extracted LaTeX)

\[h = \frac{a \sqrt{3}}{2}\]

h = \frac{a \sqrt{3}}{2}

Formula (extracted LaTeX)

\[P = 3a\]

P = 3a

Formula (extracted text)

$ A = \frac{a^2 \sqrt{3}}{4} $

Formula (extracted text)

$ h = \frac{a \sqrt{3}}{2} $

Formula (extracted text)

$ a = \sqrt{\frac{4A}{\sqrt{3}}} $

Formula (extracted text)

$ a = \frac{2h}{\sqrt{3}} $

Variables and units

No variables provided in audit spec.

Sources (authoritative):

Home — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Math & Conversions — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/math-conversions
Geometry — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/subcategories/geometry
Triangle Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/triangle-calculator
Circle Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/circle-calculator
Area Calculator – Compute Area of Common Shapes (with Steps & Formulas) — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/area
Volume Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/volume
Surface Area Calculator — Formulas, Steps, and Examples — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/surface-area

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft

Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog

0.1.0-draft — 2026-01-19: Initial draft (review required).