Geometry

30-60-90 Triangle Calculator

Easily calculate sides, area, perimeter, and other properties of a 30-60-90 triangle. Input one known value and get all other parameters instantly.

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Triangle Diagram

30-60-90 Triangle

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Understanding 30-60-90 Triangles

A 30-60-90 triangle is a special right triangle with angles of 30, 60, and 90 degrees. The sides of a 30-60-90 triangle have a specific ratio: if the shortest side (opposite to the 30° angle) is 'x', then the hypotenuse is '2x', and the longer leg (opposite to the 60° angle) is 'x√3'. This calculator helps you find all sides and other properties like area, perimeter, height, inradius, and circumradius when you know just one of these properties. It's widely used in geometry, trigonometry, and various practical applications.

  • Hypotenuse (c): The side opposite the right angle (90°).
  • Short Leg (a): Opposite to the 30° angle.
  • Long Leg (b): Opposite to the 60° angle.
  • Area: The space enclosed by the triangle.
  • Perimeter: The total length of all sides.
  • Height: The altitude to the hypotenuse.
  • Inradius: Radius of the inscribed circle.
  • Circumradius: Radius of the circumscribed circle.

Use this tool to quickly and accurately calculate the properties of 30-60-90 triangles for your math, engineering, or design needs.

Frequently Asked Questions

What is the 30-60-90 Triangle Calculator?
The 30-60-90 Triangle Calculator is an online Geometry calculator. You enter your values, and it returns the answer with the steps shown so you can follow along.
How accurate is the 30-60-90 Triangle Calculator?
The solver uses a math engine that avoids the floating-point rounding errors you get from most hardware calculators. For typical homework and professional calculations, the results will match what you would get by hand.
Can I use the 30-60-90 Triangle Calculator for professional Geometry projects?
Yes. The math behind it is standard Geometry, so the results are reliable for professional use. That said, always double-check that your inputs are in the right format before relying on the output.
Why use the 30-60-90 Triangle Calculator instead of calculating by hand?
Manual calculation is slow and error-prone, especially with multiple steps. This tool does the arithmetic for you and shows each step, so you can catch mistakes before they carry forward.
How do I format my inputs for the 30-60-90 Triangle Calculator?
Type your numbers into the input fields. Leave out units and symbols unless a field specifically asks for them. The solver handles the rest.