What is the 18" a measurement of? It can't be answered without that information.
Area 36 ft diameter circle = pi x radius squared = 3.1416 x 18 ft x 18 ft = 1017.87 sq ft
If the area of a circle is given as 67cm squared, the diameter is 9.236 cm and the circumference is 29.02 cm
diameter=radius squared circumference=pi times diameter
A(Circle)=Pi*Diameter^2 ^2 = squared or to the 2nd power
The diameter of a circle with a circumference of 18 is: 5.73
the diameter is the length across the circle, the area is pie r squared r is radius, which is half of the diameter
The circumference of a circle with a diameter of 18 inches is 56.5 inches.
The diameter of a circle is twice the radius. A circle with a radius of 9 would have a diameter of 18. (9*2=18).
The diameter is 4 and its radius is 2 because 2+2 = 4 and 2 squared = 4 Circumference of the circle: pi*4 is the same as pi*2 squared Area of the circle: pi*2 squared
The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches
pie x 4.5 squared
Perhaps you meant to say area? Circumference is a linear quantity, cm squared is an area. diameter = 2 x sqrt 324 = 36cm Circumference is 2 x pi x 18 and area is pi x 18 x 18