# The perimeter of the triangle is 20cm. Its two sides are equal to each other

August 22, 2021 | education

| **The perimeter of the triangle is 20cm. Its two sides are equal to each other, and the third, smaller side is 4 cm. What is the length of the equal sides?**

From the condition it is known that the perimeter of a triangle is 20 cm. It is also known that its two sides are equal to each other, and the third, smaller side is 4 cm. In order to find the length of the equal sides, we compose and solve a linear equation.

Let’s remember the formula for finding the perimeter of a triangle.

P = a + b + c;

We know the length of one of the sides, and we also know that the other two are equal.

Let’s make the equation:

x + x + 4 = 20;

2x = 20 – 4;

2x = 16;

x = 16: 2;

x = 8 cm length of two equal sides.

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