# The perimeter of an isosceles triangle is 18 cm. Find a side and draw a triangle.

March 30, 2021 | education

| To solve this task, you need to find the value of the sides of an isosceles triangle;

Consider this task and analyze it;

According to the condition of the task, we are given an isosceles triangle with a perimeter of eighteen centimeters, it is necessary to find the value of all sides of this triangle.

Let’s remember what a perimeter is;

The perimeter is the sum of the lengths of all sides.

In an isosceles triangle, the two sides are equal;

Let’s designate the sides of the triangle by the letters “x” and “y”, then;

2x + y = 18;

Find the side of the base;

y = 18 – 2x = 2 * (9 – x);

The sides are equal;

x = (18 – y) / 2.

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