I assume you mean a diameter of 3 feet. Divide the diameter by 2, to get the radius. Then use the standard equation for the area of a circle:
area = π x radius^2 = π x (3 ft ÷ 2)^2 = 9/4 π sq ft ≈ 7.07 sq ft
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What is the circumference of a circle 3ft
A circle with a radius of 135 units has an area of 57,255.53 square units.
A rectangle is a two dimensional object, with length and width but not height. An object with length, width and height could be a cuboid, in which case is it still the area that is required or the volume?
Yes, using two 3ft x 3ft tiles.
(2 x 3 + 2 x 3 + 3 x 3) times 2 ie (6 + 6 + 9) x 2 = 42ft2