In a circle with radius $r,$ an arc subtends an angle of measure $\theta$ at the centre. Then,the area of the major sector is $=$ ..........
- A$\frac{\pi r \theta}{180}$
- B$2 \pi r - \frac{\pi r \theta}{180}$
- C$\pi r^{2} - \frac{\pi r^{2} \theta}{360}$
- D$\frac{\pi r^{2} \theta}{360}$
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