Triangle Perimeter

The Perimeter of a Triangle calculator computes the perimeter of a triangle.  

INSTRUCTIONS: Choose units and enter the following:

• (A) Side A
• (B) Side B
• (C) Side C

Perimeter of Triangle (P):. The calculator returns perimeter in meters.  However, the answer can be automatically converted to compatible unit via the pull down menu.

The Math / Science

The formula for the perimeter of a triangle is:

       P = A + B + C

where:

• P = Perimeter of Triangle
• A = Side A
• B = Side B
• C = Side C

A triangle is a polygon with three sides, three vertices (corners), and three angles. Triangles can be classified based on the lengths of their sides and the measures of their angles as follows:

By Side Lengths:

• Equilateral Triangle: All three sides are equal in length.
• Isosceles Triangle: Two sides are equal in length.
• Scalene Triangle: All three sides have different lengths.

By Angle Measures:

• Acute Triangle: All three angles are less than 90 degrees.
• Right Triangle: One angle is exactly 90 degrees.
• Obtuse Triangle: One angle is greater than 90 degrees.

The sum of the interior angles of any triangle always adds up to 180 degrees. 

Triangle Calculators

• Area of Triangle (base and height)
• Area of Triangle (two sides and interior angle)
• Area of Triangle (two angles and interior side)
• Area of Triangle (three sides)
• Area of Equilateral Triangle
• Area of Triangle (three points)
• Height of Triangle
• Width of Triangle
• Triangle Perimeter
• Interior Angle of a triangle based on the length of three sides
• Semi-perimeter of a triangle
• Area of Circle Within a Triangle
• Area of Circle Around a Triangle
• Area between two vectors
• Triangle Volume