6 ft x 2 ft is a measure of area in 2 dimensional space - even if you choose to call it a diameter. A metre is a measure of distance and cannot be used to measure an area.
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radius = diameter ÷ 2 area = π × radius² = π × (diameter ÷ 2)² = π × (141 ÷ 2)² = 4970¼ π sq ft ≈ 15614.5 sq ft
pi ft^2
Assuming that the questions refers to the AREA of a CIRCLE with an 11 foot diameter, the answer is pi*(11/2)2 = 95.033 sq ft (to 3 dp).
Assuming the diameter is 4 feet, then the radius is half. 4 / 2 = 2 ft.
11 ft diameter gives area = 95.03 sq feet (to 2 dp)