The perimeter of an isosceles triangle is 15.6 m. Find its sides if the base is less than the side by 3 m.

Let’s solve this problem using the equation.

Let the length of the base of an isosceles triangle be x meters, then the lengths of its lateral sides are (x + 3) meters. We know that the perimeter of this isosceles triangle is 15.6 meters. Let’s make the equation:

x + x +3 + x + 3 = 15.6;

x + x + x + 6 = 15.6;

x + x + x = 15.6 – 6;

x + x + x = 6.6;

x * (1 + 1 + 1) = 6.6;

x * 3 = 6.6 (in order to find an unknown factor, you need to divide the product by a known factor);

x = 6.6: 3;

x = 2.2 meters – base length;

2.2 + 3 = 5.2 meters – the length of the bases.

Answer: 2.2 meters; 5.2 meters; 5.2 meters.