A) \[\frac{{{a}^{2}}}{2}(3-\pi )\]
B) \[\frac{{{a}^{2}}}{2}\left( \frac{\pi }{2}-1 \right)\]
C) \[2{{a}^{2}}(\pi -1)\]
D) \[\frac{{{a}^{2}}}{2}\left( \frac{\pi }{2}-1 \right)\]
Correct Answer: D
Solution :
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