Answer:
Step-by-step explanation:
The perimeter of a square is , where s is the side length.
The perimeter of an equilateral triangle is , where a is the side length.
The side length of the equilateral triangle is 5 more than the side length of the square.
The perimeter of the square and equilateral triangle are equal.
Expanding brackets.
Subtracting 3s from both sides.
The side length of the square is 15 meters.
The side length of the triangle is 20 meters.