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

    Within the intricate tapestry of geometry, equilateral triangles emerge as captivating shapes, distinguished by their harmonious symmetry and unwavering balance. These triangles possess a unique charm, not only for their aesthetic appeal but also for their profound mathematical significance. This treatise delves into the captivating world of equilateral triangles, unraveling their mathematical underpinnings, exploring their practical applications, and highlighting their intriguing properties.

    Deciphering Equilateral Triangles

    An equilateral triangle stands as a three-sided polygon where each side bears the same length, consequently resulting in interior angles that uniformly measure 60 degrees. This inherent symmetry imbues equilateral triangles with a remarkable sense of balance and visual harmony.


    Equilateral triangles, despite their simplicity, harbor a wealth of mathematical relationships. Let’s embark on a journey to uncover the key formulae that govern these enchanting shapes:


    The perimeter of an equilateral triangle, denoting the total length of its sides, can be elegantly expressed as:

    P = 3a

    where P represents the perimeter and a represents the length of one side.


    The area encompassed by an equilateral triangle, defined as the extent of its two-dimensional surface, can be calculated using the formula:

    A = (√3/4) * s^2

    where A represents the area and s represents the semiperimeter, which is half the total length of the triangle’s sides.


    The altitude of an equilateral triangle, also known as its height, denotes the perpendicular distance from a vertex to its opposing base. It can be determined using the formula:

    h = (√3/2) * a

    where h represents the altitude and a represents the length of one side.

    Benefits of Equilateral Triangles

    Equilateral triangles, beyond their mathematical elegance, offer a plethora of practical advantages:

    Structural Stability

    Due to their inherent symmetry and uniform distribution of forces, equilateral triangles are renowned for their exceptional structural stability. This property has made them a preferred choice in engineering applications, particularly in constructing bridges, towers, and trusses.

    Design and Aesthetics

    The harmonious proportions of equilateral triangles have long captivated designers and artists, leading to their widespread use in architecture, artwork, and decorative elements. Their balanced form exudes elegance and sophistication, making them a timeless aesthetic choice.

    Mathematical Applications

    Equilateral triangles serve as fundamental building blocks in various mathematical concepts. Their properties are employed in trigonometry, geometry, and even advanced mathematical fields like topology.

    Intriguing Facts

    Historical Significance

    Equilateral triangles have held a prominent position in mathematics since ancient civilizations. They were extensively studied by Greek mathematicians like Euclid and Pythagoras, who delved into their properties and applications.

    Artistic Representation

    Equilateral triangles have been a recurring motif in various art forms throughout history. They appear in ancient Egyptian hieroglyphics, Renaissance paintings, and modern abstract art, reflecting their enduring aesthetic appeal.


    1. Coxeter, H. S. M. (1961). The regular polyhedra. Dover Publications.
    2. Cundy, H. E. M., & Rollett, A. P. (1961). Mathematical models. Clarendon Press.
    3. Pedoe, D. (1970). Geometry: A comprehensive course. Addison-Wesley.
    One request?

    I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️