` s = ( "a" + "b" + "c" )/2`

Enter a value for all fields

The semi-perimeter of a triangle  calculator      Triangle  computes half the length of the perimeter of a triangle.  

INSTRUCTIONS: Choose units and enter the following:

• (a) - length of side a
• (b) - length of side b
• (c) - length of side c

Semi-Perimeter (s): The calculator computes the semi-perimeter in meters. However, this can be automatically converted to many other length units (e.g. inches) via the pull-down menu.

This formula also confirms that the three length can form a triangle. If not, an error message is returned.

The Math/Science

The formula for the semi-perimeter of a triangle is:

    s = (a + b + c) / 2

where:

• s = semi-perimeter of triangle
• a, b, c = length of the three sides of the triangle.

Triangle Calculators

• Area of a triangle base on the base and height
• Area of a triangle using two sides and the interior angle.
• Area of a triangle using two angles and the interior side.
• Area of a triangle using three known sides.
• Area of a triangle defined by three points (x,y) in a plane.
• Height of a triangle based on the area and base
• Interior Angle of a triangle based on the length of three sides
• Semi-perimeter of a triangle
• Area between two vectors

References

• Light and Matter(Dr. Benjamin Crowell) Chapter 0.12 Summary