Calculate the perimeter of an isosceles triangle with a base of 25 mm and sides of 45 mm.

In order to calculate the perimeter of a triangle, you need to add all its sides. Since the triangle is isosceles, then its two sides are equal. It is known that the base is 25 mm, and the side is 45 mm, which means that the perimeter is obtained, you need to add 25 mm from 45 mm, and from 45 mm and we get the following solution:
45 +25 + 45 = 115
This means that the perimeter is 115 mm.
Answer: the perimeter of an equal coastal triangle is 115 mm.