Question

Find the area of a circle with diameter 18 ft

Answer 1

hello : 
the area is : A=πr²
 π ≃ 3.14     r : ridus
   diameter = 2 r
r = 18/2= 9 ft  
  A=3.14×9² = 254.34 ft²

Answer 2

formula of the Area of a circle: π.R²

Diameter =18 ft so R ,te radius = 9ft

Hence area of this circle =π.(9)²= 81π ft²  OR  254.47 ft²