Question

radius =
diameter = 18.5
area =
circumference =

Explanation:

Step1: Recall radius - diameter relationship

The radius $r$ of a circle is half of the diameter $d$, i.e., $r=\frac{d}{2}$. Given $d = 18.5$ ft, then $r=\frac{18.5}{2}=9.25$ ft.

Step2: Calculate the area of the circle

The formula for the area $A$ of a circle is $A=\pi r^{2}$. Substitute $r = 9.25$ ft into the formula: $A=\pi\times(9.25)^{2}=\pi\times85.5625\approx 85.5625\times3.14 = 268.63625$ square - feet.

Step3: Calculate the circumference of the circle

The formula for the circumference $C$ of a circle is $C = \pi d$. Substitute $d=18.5$ ft into the formula: $C=\pi\times18.5\approx3.14\times18.5 = 58.09$ ft.

Answer:

Radius = $9.25$ ft
Diameter = $18.5$ ft
Area $\approx268.64$ square - feet
Circumference $\approx58.09$ ft