What is the approximate area of the shaded sector in the circle shown below?

The diameter of the circle is 5.4 cm. The shaded area is 180 degrees, which is 1/2 of the circle.

Calculate the area of the full circle and divide by 2.
 Area = PI x r^2
r = 5.4/2 = 2.7

Area = 3.14 x 2.7^2 = 22.90

Area of shaded part: 22.90 / 2 = 11.45 cm^2.

The answer is A.

I'm pretty sure it's b). i try drawing the functions out and b is the one that stands out or isnt a "line"