The total plane angle subtended by a circle at its centre is ......... $rad$
A$\pi$
B$2 \pi$
C$\frac{2 \pi}{3}$
D$\frac{\pi}{2}$
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B$2 \pi$
b (b)
The total plane angle is $360^{\circ}$ or $2 \pi \,rad$.
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