One side of the triangle is 25 cm, it is 4 cm more than the second side and 5 cm less than the third.

One side of the triangle is 25 cm, it is 4 cm more than the second side and 5 cm less than the third. Calculate the perimeir of this triangle.

First of all, we find the lengths of the sides of the triangle.

The second side of the triangle is 4 cm shorter than the first, which is 25 cm long.

Find the length of the second side:

25 – 4 = 21 (cm).

The third side of the triangle, by condition, is 5 cm larger than the first side:

25 + 5 = 30 (cm).

Find the perimeter of the triangle by adding the lengths of its three sides, if the sides of the triangle are 25 cm, 21 cm and 30 cm:

P = 25 + 21 + 30 = 76 (cm).

Answer: the perimeter of the triangle is 76 cm.