Triangle Calculator
Results
Select a calculation method, enter your values, and click "Calculate Area" to see results.
Triangle Calculator – Calculate Area, Perimeter & Angles Online
A Triangle Calculator is a free online tool that helps you calculate the area, perimeter, and angles of a triangle using different known values. Whether you know the base and height, three sides, or two sides with an included angle, this calculator gives instant and accurate results.
At easycalculator.org, our Triangle Calculator is designed for students, teachers, engineers, and exam aspirants who want fast and error-free triangle calculations.
What Is a Triangle?
A triangle is a geometric shape with three sides, three angles, and three vertices. The sum of all interior angles of a triangle is always 180°.
- 📐 Used in mathematics and geometry
- 🏗️ Important in construction and architecture
- ⚙️ Common in engineering and design
- 📘 Frequently asked in school and competitive exams
Triangle Calculation Methods
1. Using Base & Height
This method is used when the base and height of the triangle are known.
Example:
Base = 10 cm, Height = 6 cm
Area = 30 cm²
2. Using Three Sides (Heron’s Formula)
When all three sides of a triangle are known, the calculator uses Heron’s Formula.
s = (a + b + c) / 2
Area = √[ s(s − a)(s − b)(s − c) ]
This method is ideal for scalene triangles where height is not available.
3. Using Two Sides & Included Angle
This method is used when two sides and theincluded angle between them are known.
Commonly used in trigonometry andengineering calculations.
Why Use Our Triangle Calculator?
Frequently Asked Questions (FAQs)
It is an online tool that calculates the area, perimeter, and angles of a triangle using given sides or angles.
Base–Height formula, Heron’s formula, and trigonometric sine formula.
Yes, it uses standard mathematical formulas to deliver precise results.