Triangle Calculator
Title: Triangle Calculator Solve Area, Perimeter & Angles.
Description: Use our Triangle Calculator to find area, perimeter, angles, or sides based on various input options. Great for geometry students.

Triangle Calculator

Determine the area, perimeter, angles, and side lengths of any triangle using our versatile Triangle Calculator. Useful for school geometry, architecture, and engineering calculations.

• Solve with sides, angles, or height.
• Supports multiple triangle formulas.
• Step-by-step solution display.

A triangle calculator determines unknown triangle measurements using known sides and angles. This comprehensive triangle calculator handles right triangles, oblique triangles, and provides area, perimeter, and angle calculations.

The triangle calculator uses trigonometric principles for accurate results. This mathematical triangle calculator employs sine rule, cosine rule, and Pythagorean theorem to solve various triangle problems efficiently.

Our advanced triangle calculator includes multiple solving methods. This versatile triangle calculator works with side-side-side, side-angle-side, angle-side-angle, and other triangle configurations for complete problem solving.

The triangle calculator is essential for geometry and trigonometry students. This educational triangle calculator supports coursework in mathematics, physics, and engineering by providing accurate geometric calculations.

Triangle Calculator

Calculate triangle area, perimeter, angles, and sides. Supports right triangles, equilateral, isosceles, and scalene triangles with step-by-step solutions.

Input Parameters

Triangle Type                         Any Triangle                         Right Triangle                         Equilateral                         Isosceles                     Sides (a, b, c)Angles (A°, B°, C°)Area Calculation Method                         Auto Select (Recommended)                         Base × Height / 2                         Heron’s Formula                         Trigonometric Formula (½ab sinC)                     CalculateReset

Triangle Visualization

Enter values to see triangle type

Calculation Results

Area

–

Perimeter

–

Semi-perimeter

–

Angles

A: -°, B: -°, C: -°

Triangle Validity

–

Calculation Steps

Enter values and click Calculate to see step-by-step solution.

Triangle Calculator – Calculate Triangle Properties | All rights reserved

he longest edge of a right triangle, which is the edge opposite the right angle, is called the hypotenuse. Any triangle that is not a right triangle is classified as an oblique triangle and can either be obtuse or acute. In an obtuse triangle, one of the angles of the triangle is greater than 90°, while in an acute triangle, all of the angles are less than 90°, as shown below.

 A triangle is usually referred to by its vertices. Hence, a triangle with vertices a, b, and c is typically denoted as Δabc.
Furthermore, triangles tend to be described based on the length of their sides, as well as their internal angles.
For example, a triangle in which all three sides have equal lengths is called an equilateral triangle while a triangle in which two sides have equal lengths is called isosceles.

 As can be seen from the triangles above, the length and internal angles of a triangle are directly related, so it makes sense that an equilateral triangle has three equal internal angles, and three equal length sides.
Note that the triangle provided in the calculator is not shown to scale; while it looks equilateral (and has angle markings that typically would be read as equal), it is not necessarily equilateral and is simply a representation of a triangle.

The Pythagorean theorem is a theorem specific to right triangles.
For any right triangle, the square of the length of the hypotenuse equals the sum of the squares of the lengths of the two other sides. It follows that any triangle in which the sides satisfy this condition is a right triangle.
There are also special cases of right triangles, such as the 30° 60° 90, 45° 45° 90°, and 3 4 5 right triangles that facilitate calculations.
Professional surveyors and engineers use our triangle calculator for field applications. This practical triangle calculator supports construction, surveying, and engineering projects requiring precise geometric measurements.

The triangle calculator also includes special triangle properties and classifications. This comprehensive triangle calculator identifies triangle types and provides relevant geometric properties and relationships.

Solve triangle problems with our accurate triangle calculator. This triangle calculator provides the geometric calculation tools you need for academic success and professional geometric problem-solving requirements.