Geometry

Question Analysis:
This word problem applies the property of equal opposite sides to a real-world context, requiring perimeter calculation.

Key Concept Explanation:
In parallelograms:
Opposite sides are equal in length (AB = CD, AD = BC)
Perimeter = sum of all sides = 2×(length + width)

Step-by-Step Solution:
Identify given sides:
AB = 120 m → CD = 120 m
AD = 80 m → BC = 80 m
Calculate perimeter:
2 × (120 + 80) = 2 × 200 = 400 meters

Common Mistakes:
Adding only three sides
Multiplying sides instead of adding
Confusing...