In an isosceles triangle, the base is three times smaller than the side, and the perimeter is 70 cm

In an isosceles triangle, the base is three times smaller than the side, and the perimeter is 70 cm. Calculate the lengths of the sides of the triangle.

Let the base of an isosceles triangle equal x, then each of the lateral sides is equal to 3x. Knowing that the perimeter of this triangle is 70 cm, we will compose the equation:
x + 3x + 3x = 70;
7x = 70;
x = 70/7 = 10.
Therefore, the base is 10 cm, the sides are 10 * 3 = 30 cm.