# Write down the expression for the perimeter of the triangle ABC and simplify it if AB = x cm

July 27, 2021 | education

| **Write down the expression for the perimeter of the triangle ABC and simplify it if AB = x cm, BC is 2 times more AB, and AC is 7 cm less than BC**

The perimeter of a triangle is equal to the sum of all its sides.

In our problem, if AB = x cm, and BC is 2 times more than AB, then BC = 2x cm.

If AC is 7 cm less than BC, then AC = (2x – 7) cm.

Find the perimeter of this triangle:

P = x + 2x + 2x – 7.

Let’s simplify the equation:

P = (5x – 7) cm.

Answer: (5x – 7) cm.

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