Triangle Calculator

Triangle Calculator Template

This tool helps you calculate various properties of a triangle. You can input values for sides A, B, and C, as well as angles a, b, and c. The calculator can handle both degrees and radians for angles. When entering angles in radians, you can use values like pi/2, pi/4, etc.

To get started, enter at least three values, including at least one side, and click “Calculate.” The calculator will determine the missing sides or angles and identify the type of triangle (e.g., Equilateral, Isosceles, Scalene, Right, Obtuse, or Acute).

a b c C B A

About Triangles

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. Depending on the lengths of its sides and the measures of its angles, a triangle can be classified as:
  • Equilateral: All three sides are equal, and all three angles are 60°.
  • Isosceles: Two sides are of equal length, and the angles opposite these sides are equal.
  • Scalene: All three sides are of different lengths, and all three angles are different.
  • Right Triangle: One of the angles is exactly 90°.
  • Obtuse Triangle: One of the angles is greater than 90°.
  • Acute Triangle: All three angles are less than 90°.

About Triangles

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. Depending on the lengths of its sides and the measures of its angles, a triangle can be classified as:

  • Equilateral: All three sides are equal, and all three angles are 60°.
  • Isosceles: Two sides are of equal length, and the angles opposite these sides are equal.
  • Scalene: All three sides are of different lengths, and all three angles are different.
  • Right Triangle: One of the angles is exactly 90°.
  • Obtuse Triangle: One of the angles is greater than 90°.
  • Acute Triangle: All three angles are less than 90°.