Each side of a triangle is 4cm long, and its circumference is 120cm. Find the longest side The length difference of each side of a triangle is 4cm. Its perimeter is 120cm. How many cm is the longest side?

Each side of a triangle is 4cm long, and its circumference is 120cm. Find the longest side The length difference of each side of a triangle is 4cm. Its perimeter is 120cm. How many cm is the longest side?

Suppose that the longest side is x cm, then there is
x+x-4+x-8=120
x=44
So the longest side is 44 cm

If the side length of an equilateral triangle is a centimeter, then its circumference is () centimeter

3a

The length of one side of an equilateral triangle is 2 / 7 decimeters. How many decimeters is its circumference?

Two out of seven equals six out of seven