You would take 12 X 20, and that equals 240. $120 is your answer.
ANSWER
A. (243pi+162) ft^2
EXPLANATION
The area of the shaded region is the sum of the area of the major sector and the area of the isosceles triangle.
Area of major sector
<h3>
![=\frac{360-90}{360}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B360-90%7D%7B360%7D)
×
![\pi](https://tex.z-dn.net/?f=%5Cpi)
×
![18^2](https://tex.z-dn.net/?f=18%5E2)
</h3>
![=243\pi ft^2](https://tex.z-dn.net/?f=%3D243%5Cpi%20ft%5E2)
The area of the isosceles triangle is calculated using the formula;
![=\frac{1}{2}r^2sin(0)](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B2%7Dr%5E2sin%280%29)
<h3>
![=\frac{1}{2}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B2%7D)
×
![sin(90)](https://tex.z-dn.net/?f=sin%2890%29)
</h3>
![=162ft^2](https://tex.z-dn.net/?f=%3D162ft%5E2)
The area of the shaded region
![=(243\pi +162)ft^2](https://tex.z-dn.net/?f=%3D%28243%5Cpi%20%2B162%29ft%5E2)
The correct answer is A.
![There!](https://tex.z-dn.net/?f=There%21)
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Hopefully, this helps you!!
![AnimeVines](https://tex.z-dn.net/?f=AnimeVines)
To know if two fractions are proportionate, we need to cross multiply the fractions, if their cross products are equal, then they are proportionate, if not then they are not proportionate, however we can solve for the number that will make each fraction proportionate to the other.
12/21 = 15/24
cross multiply.
12*24 = 15*21
288 = 315 * not proportionate
because we use the 1st fraction as basis, we need to adjust the 2nd fraction to make it proportionate to the 1st fraction.
12/21 we can multiply the fraction by any number as long as we multiply the number to both numerator and denominator to keep the 2nd fraction in proportion to the first fraction.