The perimeter of a triangle is 167 cm. Its two sides are 56 cm long. Find the length of the third side of this triangle.

We know that the perimeter of a triangle is the sum of the lengths of its three sides. Let’s write down the formula for clarity:

P = a + b + c, where P is the perimeter, a, b, c are the sides of the triangle.

If we know the perimeter and two sides, then we can calculate the length of the third side of the triangle, it will be equal to:

a = P – b – c.

So, let’s calculate what the third side of the triangle is if we know that the perimeter is 167 cm, and its two sides are 56 cm each.

a = 167 – 56 – 56;

a = 55 cm.

Answer: The third side of the triangle is 55 cm.