15 x 3.1416, call it 47 and an eighth inches.
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If you want the area of a circle, and you know the diameter, then: A = pi*r^2, where r is the radius, and is 1/2 the diameter, so pi*(diameter/2)^2 = (pi/4)*(diameter)^2. If you want square inches, then make sure you have the diameter measurement in inches, first.
A sphere cannot have a length of 4 inches and a diameter of 3 inches. Make sure you know what shape your question is about!
pi*32 = 100.53 inches (approx)
pi*radius2 = 1693.14 square inches Make the radius the subject of the above then double for the diameter diameter = 46.430 inches to 3 decimal places
Circumference of a 25 feet circle = pie x diameter x 12 942.477 inch 1 feet = 12 inch so i converted into inch as i am having the other component in inch No of 12 inch long blocks = circumference /12 so total 78 pieces will be required to make a circle of dia 25 feet