The lateral side AB of an isosceles triangle ABC is twice as long as the base of AC. Calculate the lengths of the sides

The lateral side AB of an isosceles triangle ABC is twice as long as the base of AC. Calculate the lengths of the sides of a triangle if its perimeter is 45 cm. What are the equal sides in this triangle

let the base be x cm, then the lateral side will be 2x. the perimeter of the triangle is 45. Let’s make the equation
x + 2x + 2x = 45
5x = 45
x = 9-base AC
9 * 2 = 18 side AB = side BC
answer: 18; 18; 9