If the radius of a circle is 2.5 in then the circumference = 2π x 2.5 = 5π = 15.71 (2dp)
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Circumference = pi*diameter = 21.99 inches, approx.
The area of a circle that has a circumference of 18 is 25.78 inches squared.
radius=13 area=40.82 circumfrence=8.28025477707
circumfrence
25 inches = 63.5 centimeters