One side of the triangle is 3 cm, the other side is twice the first, and the third side

One side of the triangle is 3 cm, the other side is twice the first, and the third side is half the sum of the other two sides. Find the perimeter of the triangle.

Let’s solve this task by actions with explanations.

1) 3 * 2 = 6 centimeters – the length of the second side, since it is 2 times larger than the first side, and the length of the first side is 3 centimeters;

2) 6 + 3 = 9 centimeters – the sum of the lengths of the first and second sides, since the first side is 3 centimeters, and the second side is 6 centimeters;

3) 9: 2 = 4.5 centimeters – the length of the third side, since it is equal to half the sum of the other two sides;

4) 6 + 3 + 4.5 = 13.5 centimeters – the perimeter of the triangle.

Answer: 13.5 centimeters.