The perimeter of a triangle is found by adding the lengths of all three sides together. The basic formula is:
Perimeter=a+b+c\text{Perimeter}=a+b+cPerimeter=a+b+c
where aaa, bbb, and ccc are the lengths of the three sides of the triangle. This formula applies to all types of triangles:
- For a scalene triangle with three different side lengths, simply add all three sides.
- For an isosceles triangle with two equal sides, the formula is 2a+b2a+b2a+b where aaa is the length of each equal side, and bbb is the third side.
- For an equilateral triangle where all sides are equal, the perimeter is 3×a3\times a3×a where aaa is the length of each side.
To find the perimeter:
- Measure all three sides (making sure all units are the same).
- Add the side lengths together.
- The sum is the perimeter.
For example, if a triangle has sides 6 inches, 8 inches, and 10 inches, the perimeter is 6+8+10=246+8+10=246+8+10=24 inches.
