Answer:
314 square cenntimeters
Step-by-step explanation:
Area of the circular cross-section of the pipe = πd²/4
Given that;
d = 20cm
Area = π(20)²/4
Area = 400π/4
Area = 100π
Area = 100(3.14)
Area = 314cm²
Hence the area of the circular cross-section of this pipe is 314 square cenntimeters