One side of the triangle is 11.6 cm, the second is 3.2 cm less and the third is equal to the sum

One side of the triangle is 11.6 cm, the second is 3.2 cm less and the third is equal to the sum of these two sides. Find the perimeter of the triangle.

Brief entry.

1 side = 11.6 cm;

2 side =? 3.2 cm less;

3 side = 1 side + 2 side;

Perimeter =?

1. From the problem statement we know that the length of the first side of the triangle is 11.6 cm.

2. Let’s calculate what is the length of the second side, if we also know that it is 3.2 cm less than the first side.

11.6 – 3.2 = 8.4 cm.

3. And now we find out the length of the third side, which is equal to the sum of the lengths of the first two sides.

11.6 + 8.4 = 20 cm.

Next, we calculate the perimeter of the triangle.

11.6 + 8.4 = 20 = 40 cm.