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

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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