Right Triangles Calculator

  • Enter side lengths and angles for your right triangle.
  • Click "Calculate" to calculate the results.
  • The calculation details, including formulas used, will be displayed.
  • A bar chart will visually represent the side lengths and angles.
  • Your calculation history will be displayed below.
  • Click "Clear" to reset the inputs and calculation details.
  • Click "Copy Results" to copy the calculation details to the clipboard.
Calculation History:


    The Right Triangles Calculator is a versatile tool that simplifies trigonometric calculations involving right triangles. Whether you are a student, a teacher, an engineer, or anyone dealing with geometry or trigonometry, this tool can save you valuable time and effort.


    The concept of the Right Triangles Calculator is straightforward: it aids in solving right triangle problems by automating the calculation of various trigonometric values, including angles and side lengths. Right triangles have one angle of 90 degrees, making them particularly suitable for trigonometric calculations.


    To understand the capabilities of the Right Triangles Calculator, it’s essential to be familiar with the underlying formulae:

    Pythagorean Theorem

    The Pythagorean Theorem states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. This can be represented as:

    c² = a² + b²


    • c is the length of the hypotenuse.
    • a and b are the lengths of the other two sides.

    Sine, Cosine, and Tangent

    The sine, cosine, and tangent functions are fundamental trigonometric ratios in right triangles:

    • Sine (sinθ): The ratio of the length of the side opposite an angle to the length of the hypotenuse. It can be calculated as: sinθ = (opposite side) / (hypotenuse)
    • Cosine (cosθ): The ratio of the length of the adjacent side to the length of the hypotenuse. It can be calculated as: cosθ = (adjacent side) / (hypotenuse)
    • Tangent (tanθ): The ratio of the length of the side opposite an angle to the length of the adjacent side. It can be calculated as: tanθ = (opposite side) / (adjacent side)

    These formulae are fundamental in solving various right triangle problems, and the Right Triangles Calculator leverages them to provide quick and accurate results.

    Example Calculations

    Let’s illustrate the power of the Right Triangles Calculator with some example calculations:

    Example 1: Finding Missing Side Lengths

    Suppose we have a right triangle with an angle of 30 degrees and one side of length 5 units. Using the calculator, we can quickly find the length of the other two sides:

    • a (opposite side) = 5 * sin(30°)
    • b (adjacent side) = 5 * cos(30°)

    Example 2: Determining an Angle

    In a different scenario, we have a right triangle with side lengths a = 7 units and b = 9 units. We want to find the angle θ opposite the side a. Using the calculator:

    • θ = tan⁻¹(7 / 9)

    These examples demonstrate how the Right Triangles Calculator streamlines calculations, particularly when dealing with real-world problems.

    Real-World Use Cases

    The Right Triangles Calculator finds applications in various fields and professions:


    Engineers frequently encounter right triangles in structural design, mechanics, and electrical circuits. The calculator helps them determine angles and side lengths crucial for solving complex problems.


    In construction and architecture, accurate measurements are essential. The calculator aids builders in calculating angles and dimensions for various projects, ensuring structural stability and precision.

    Land Surveying

    Land surveyors use right triangles to measure distances, elevations, and angles when mapping land or planning construction projects. The tool simplifies these calculations, increasing surveying efficiency.


    Teachers and students benefit from the calculator as an educational tool. It provides a visual representation of right triangles, helping learners understand trigonometric concepts effectively.

    DIY Projects

    For individuals working on do-it-yourself (DIY) projects, the Right Triangles Calculator simplifies tasks like cutting angles for woodworking or determining roof slopes for home improvement projects.


    The Right Triangles Calculator is a valuable tool that enhances the efficiency and accuracy of trigonometric calculations involving right triangles. Its ability to automate the computation of angles and side lengths makes it indispensable in fields such as engineering, construction, land surveying, education, and DIY projects. By streamlining these calculations, the calculator empowers individuals and professionals to solve real-world problems with ease.


    1. Stewart, James. (2015). “Calculus: Early Transcendentals.” Cengage Learning.
    2. Larson, Ron, & Edwards, Bruce H. (2017). “Calculus: Early Transcendental Functions.” Cengage Learning.

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