Find the area of the shaded region in the figure Find the area of the shaded region in the figure

What steps should I do? I tried following the steps listed here https://answers.yahoo.com/question/index?qid=20100305030526AAef8nZ
But I got 150.7 which is wrong.

Area of white strip=Area of sector subtending$\frac{\pi}{3}$ at the center-Area of equilateral triangle
Area of sector subtending$\frac{\pi}{3}$ at the center=$\frac{1}{2}\theta r^2=\frac{1}{2}\frac{\pi}{3} (12)^2=24\pi=24\times 3.14=75.36 $sq units
Area of equilateral triangle=$\frac{\sqrt3}{4}$(side)$^2$=$\frac{\sqrt3}{4}$(12)$^2$=36$\sqrt3=$62.35 sq units
Area of white strip=75.36 -62.35=13.01 sq units
Area of circle=$\pi r^2=3.14\times12\times12=452.16$sq units
Shaded area=Area of circle-Area of white strip=452.16-13.01=439.15 sq units
