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` 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 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.

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