Perimeter = 20 cm, its base is 2 times smaller than the lateral side, calculate the lengths of the sides of the triangle.

An isosceles triangle is a triangle in which the two sides and the angles at these sides are equal, and the third side is called the base. Let’s designate the base, that is, the AC side behind x, then the AB side is equal to the BC side and is equal to 2x centimeters. Knowing that the perimeter is 20 centimeters. let’s make an equation. The perimeter of any shape is equal to the sum of the lengths of all its sides.

x + 2x + 2x = 20;

5 * x = 20;

x = 20/5;

x = 4;

AC = 4 cm, AB = BC = 4 * 2 = 8 cm.

Answer: 4 cm, 8 cm, 8 cm.