What is the correct answer?
4
A. π (r₁ + r₂) + [(r₁ + r₂)²/x] + 2x
B. π (r₁ + r₂) + [(r₁ - r₂)²/x] + 2x
C. π (r₁ - r₂) + [(r₁ - r₂)²/x] + 2x
D. π (r₁ - r₂) + [(r₁ + r₂)²/x] + 2x