You have answered the question for yourself!!! THe answer is 2 ft.
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Area = pi*r2r(radius) = diameter/2 = 16 feet/2 = 8 feetArea = pi(8 ft)2= 201 ft2======
To find the circumference of a circle with a diameter of 6 feet, you first need to calculate the radius, which is half of the diameter. So, the radius would be 6 feet divided by 2, which equals 3 feet. The formula for the circumference of a circle is 2πr, where r is the radius. Therefore, the circumference of a circle with a 6-foot diameter would be 2 x π x 3 feet, which equals approximately 18.85 feet.
Ummm . . . there is 1 square foot in a square foot. The square foot could be any dimensions, like 1 foot by 1 foot, or half a foot by 2 feet, or a quarter of a foot by 4 feet . . . . .
There will be about 5757 US gallons in a full tank of this size. A cylinder's volume is the area of the base times its height. The area of the base is pi times the square of the radius of that base. A radius is half a diameter. Half of 7 feet is 3 1/2 feet. If we take pi times the square of that, we'll get about 38.48 square feet. Multiply that by the 20 foot length and you'll get about 769.6 cubic feet. There are about 7.5 gallons in a cubic foot of water. Multiply the 769.6 feet3 (the volume) by 7.5 gallons/foot3 and there's the (approximately) 5757 gallons (US) in that tank.
First you determine the radius of the circle. If 6.6 feet refers to the diameter, divide that by 2 to get the radius. Then you use the standard formula for the area of a circle.