Questions: The area of the sector is 668.15 square feet.

Solution Steps

The area of a sector of a circle with radius \(r\) and central angle \(\theta\) (in radians) is given by the formula \(A = \frac{1}{2}r^2\theta\). In this case, the radius is \(r = 20\) feet and the central angle is \(\theta = 145^\circ\). First, convert the angle to radians:

\(\theta = 145^\circ \times \frac{\pi}{180^\circ} = \frac{29\pi}{36}\) radians.

Now plug the values into the formula for the area of a sector:

\(A = \frac{1}{2}(20^2)\left(\frac{29\pi}{36}\right) = \frac{1}{2}(400)\left(\frac{29\pi}{36}\right) = 200\left(\frac{29\pi}{36}\right) = \frac{5800\pi}{36} = \frac{1450\pi}{9}\)

Now calculate the value and round to two decimal places:

\(A = \frac{1450\pi}{9} \approx 506.145\)

Rounding to two decimal places gives 506.15 square feet.

Final Answer