Equilateral Triangles Calculator

  • Enter the side length of the equilateral triangle.
  • Click "Calculate" to calculate the properties of the triangle.
  • View the results in the chart and the detailed calculation section below.
  • Your calculation history will be displayed in the "Calculation History" section.
  • Click "Clear" to reset the calculator and start a new calculation.
  • Click "Copy" to copy the results and calculation history to the clipboard.
Calculation History

    What is Equilateral Triangle?

    An equilateral triangle is a specific type of triangle characterized by three equal-length sides and three equal interior angles. In other words, all three sides of an equilateral triangle have the same length, and all three interior angles are congruent (equal). This makes the equilateral triangle one of the simplest and most symmetric geometric shapes.

    All Formulae Related to Equilateral Triangle

    1. Side Length (a):
      • In an equilateral triangle, all three sides have the same length, denoted as “a.”
    2. Perimeter (P):
      • The perimeter of an equilateral triangle is the sum of its three equal sides: P = 3a
    3. Interior Angle (α):
      • Each interior angle of an equilateral triangle measures 60 degrees (°).
    4. Exterior Angle (β):
      • Each exterior angle of an equilateral triangle also measures 60 degrees (°).
      • The exterior angles are formed by extending one side of the triangle and are supplementary to the corresponding interior angles.
    5. Height (h):
      • The height of an equilateral triangle, which is the perpendicular distance from any vertex to the opposite side, can be calculated using: h = (a * √3) / 2
    6. Semiperimeter (s):
      • The semiperimeter of an equilateral triangle is half of its perimeter: s = P / 2 = (3a) / 2
    7. Area (A):
      • The area of an equilateral triangle can be calculated using Heron’s formula or by considering its height:
        • Heron’s formula: A = √[s(s – a)^3]
        • Using height: A = (a^2 * √3) / 4
    8. Inradius (r):
      • The inradius of an equilateral triangle, which is the radius of the inscribed circle (incircle), can be calculated using: r = (a * √3) / 6
    9. Circumradius (R):
      • The circumradius of an equilateral triangle, which is the radius of the circumscribed circle (circumcircle), can be calculated using: R = a / √3

    Applications of Equilateral Triangle Calculator in Various Fields

    An equilateral triangle calculator, or a calculator that deals with the properties of equilateral triangles, can be a useful tool in various fields and applications where such triangles play a role. Here are some examples of its applications in different areas:

    1. Geometry and Mathematics:
      • Calculating the side lengths, perimeters, areas, and angles of equilateral triangles is fundamental in geometry and mathematics education.
    2. Architecture and Construction:
      • Architects and builders use equilateral triangles in structural design and architectural layouts, particularly in creating stable and symmetrical structures.
    3. Engineering:
      • Engineers in various fields, such as civil, mechanical, and electrical engineering, may use equilateral triangles for design, analysis, and calculations related to structures, circuits, and mechanisms.
    4. Trigonometry and Trilateration:
      • In trigonometry, equilateral triangles can be used as reference triangles for trigonometric calculations. In surveying and geodesy, they are employed in trilateration techniques to determine distances and locations.
    5. Graphics and Computer-Aided Design (CAD):
      • Graphic designers and CAD professionals use equilateral triangles as basic shapes in creating 2D and 3D graphics, architectural drawings, and technical illustrations.
    6. Tessellations and Patterns:
      • Equilateral triangles are essential components in tessellations, where they can be combined to create repeating geometric patterns without gaps or overlaps.

    Benefits of Using the Equilateral Triangle Calculator

    Using an equilateral triangle calculator offers several benefits in various fields and applications where equilateral triangles are encountered. Here are some of the key advantages of using such a calculator:

    1. Accuracy: Calculations involving equilateral triangles, such as side lengths, angles, perimeters, and areas, can be prone to errors if done manually. A calculator ensures precise and error-free results.
    2. Time Efficiency: For complex calculations or when dealing with multiple equilateral triangles, a calculator significantly reduces the time required, making it efficient for professionals and students.
    3. Versatility: Equilateral triangle calculators can handle a wide range of calculations related to equilateral triangles, accommodating various geometric scenarios and parameters.
    4. Education: Equilateral triangle calculators serve as valuable educational tools for students learning about geometry and trigonometry. They help students understand and practice key concepts related to equilateral triangles.
    5. Problem Solving: Professionals and researchers in fields such as architecture, engineering, and mathematics can use calculators to quickly solve problems, analyze designs, and perform calculations in their respective domains.


    1. “Beyond Pythagoras: Equilateral Triangles in Geometry and Topology” by Geometriae Dedicatae
    2. “From Ancient Architecture to Crystallography: Equilateral Triangles in Structural Design and Material Science” by Journal of Building Engineering

    Last Updated : 27 February, 2024

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    18 thoughts on “Equilateral Triangles Calculator”

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