The perimeter of an isosceles triangle is 28 cm, the side is 3 times the base. Find the length of the sides of the triangle.

Given:
The perimeter of an isosceles triangle is 28 centimeters.
The lateral side is 3 times larger than the base.

Let the base be x centimeters.
Then the side of the triangle is 3 centimeters.
Then the second side of the figure will also be equal to 3 centimeters.
Let’s make the equation:
x + 3x + 3x = 28;
7x = 28;
x = 28: 7;
x = 4.
The base of the triangle is 4 centimeters.
Let’s calculate each of the lateral sides:
3 * 4 = 12 centimeters.
Answer: 12 centimeters.