Radius = 12.414 inches (to 3 dp)
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Circumference of a circle = PI x D, so answer is 3.142 x 78 = 245.08 ft
245.044227, approx
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
Divide the area by the value of Pi to get the diameter. Divide the diameter by 2 to get the radius !
The arc is: 19.06 units