1. $$\frac{\pi }{4}{{\text{d}}^2}{\sigma _{\text{t}}}$$
  2. $$\frac{\pi }{4}{{\text{d}}^2}\tau $$
  3. $$\frac{\pi }{2}{{\text{d}}^2}{\sigma _{\text{t}}}$$
  4. $$\frac{\pi }{2}{{\text{d}}^2}\tau $$
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1 Answers

Answer: Option 4

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