# One side of the triangle is 15cm, the second is 4cm longer, and the third is 4cm shorter

One side of the triangle is 15cm, the second is 4cm longer, and the third is 4cm shorter than the first. what is the perimeter of the triangle?

In order to find the perimeter of a triangle, recall the formula:

P = a + b + c;

The perimeter is the sum of the lengths of the three sides of the triangle.

We know the length of one of the sides and it is 15 cm.

We can also find each of the parties based on the condition.

The second side is known to be 4 cm longer than the first. We are looking for her:

15 + 4 = 19 cm.

And the third party is known to be 4 cm shorter than the first. We are looking for her:

15 – 4 = 11 cm.

It remains for us to calculate the perimeter using the formula:

P = 15 + 19 + 11 = 45 cm perimeter.

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