Area of a circle in terms of radius: Area = π·r2 = 3.14·192 = 1134 square mm(*) Area of a circle in terms of diameter: Area = π·(d 2 )2 = 3.14·(38 2 )2 = 3.14·(19)2 = 1134 square mm(*) Area of a circle in terms of circumference: Area = C2 4π = 119.42 4π = 14256.36 (4·3.14) = 14256.36 12.56 = 1134 square mm(*)
