The perimeter of an isosceles triangle is 2m, and its base is 0.4m, find the side.

We have an isosceles triangle ABC, in which AC is the base, AC = 0.4 m, AB and BC are the sides, the perimeter of triangle ABC is 2 m.

In an isosceles triangle, the sides are equal, so AB = BC.

The perimeter of a triangle is equal to the sum of the lengths of its sides:

P = AB + BC + AC.

The perimeter of an isosceles triangle is:

P = 2AB + AC.

Knowing the perimeter of the triangle and its base, you can calculate the length of the side:

AB = (P – AC) / 2.

Calculate the side of a given triangle:

AB = (2 – 0.4) / 2 = 1.6 / 2 = 0.8 m.

Answer: 0.8 m.