Find the sides of an isosceles triangle if the perimeter is 70 cm, and the base is 2 times smaller than the side.

It is known that in an isosceles triangle, the sides are equal, and the perimeter is the sum of the lengths of all sides of the figure.
Take the lateral side of an isosceles triangle as X, then
2X-two sides of the triangle
X / 2 (0.5X) – the length of the base (according to the condition, it is 2 times less than the lateral side.
Let’s make the equation:
2X + 0.5X = 70
2.5X = 70
X = 70: 2.5
X = 28 (cm) – length of the lateral sides of an isosceles triangle
1) 28 * 0.5 = 14 (cm) – the length of the base of the triangle.
Answer: the length of the sides = 28 cm, the length of the base = 14 cm.