Perimeter of a triangle = (length of side #1) + (length of side #2) + (length of side #3)
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The perimeter formula of a triangle is the sum of the lengths of all three sides. Mathematically, it can be expressed as P = a + b + c, where P is the perimeter and a, b, and c are the lengths of the three sides of the triangle.
It depends on what the formula is for: the area or perimeter or some other characteristic.
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The perimeter of a triangle is the sum of its 3 sides.
To find the perimeter of a triangle, use the formula a+b+c. ex: The sides are 4, 8, and 6. P=a+b+c P=4+8+6+= P=18