Use this triangle perimeter calculator to quickly calculate triangle perimeter when you know all three sides. The tool also demonstrates the triangle perimeter formula for easy understanding.
P = triangle perimeter
a, b, c = sides of the triangle
The triangle perimeter formula sums all three sides to get the perimeter.
| Side a | Side b | Side c | Perimeter |
|---|---|---|---|
| 3 | 4 | 5 | 12 |
| 5 | 5 | 8 | 18 |
| 6 | 7 | 10 | 23 |
| 8 | 10 | 12 | 30 |
| 9 | 9 | 9 | 27 |
To understand how to calculate triangle perimeter manually:
1. Measure all three sides of the triangle.
2. Sum the values of sides a, b, and c.
3. The total is the perimeter.
Using the triangle perimeter formula, calculation becomes straightforward.
This triangle perimeter calculator automatically computes the perimeter using the triangle perimeter formula. Enter all three sides to get the result with six decimal places.
It works on desktop and mobile devices, useful for students, teachers, engineers, and anyone learning geometry.
• The sum of interior angles of a triangle is always 180°.
• Triangles are used in construction for their stability.
• Equilateral triangles have all sides equal.
• Isosceles triangles have two sides equal.
• Scalene triangles have all sides different.