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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