A rope is laid out to form a square enclosure. If 20 meters of rope remain unused after enclosing the square, and the area of the square is 100 m², what was the original length of the rope?
Show answer & explanation
Correct answer: A
Explanation
Area of the square = 100 m²
Unused rope = 20 m
According to the formula:
Side = √Area
Perimeter = 4 × Side
Side = √100 = 10
Perimeter = 4 × 10 = 40
Total rope = 40 + 20 = 60 meters