1.

• A. $\frac{\theta }{360}{\mathrm{\pi r}}^2$
• B. $\frac{\theta }{360}{\mathrm{\pi r}}^2$
• C. $\frac{\theta }{360}{\mathrm{\pi r}}^2$
• D. $\frac{\theta }{360}{\mathrm{\pi r}}^2$

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