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1. $x^{2} + y^{2} = a^{2}$

A. $\frac{3 a^{2}}{4}$
B. $\frac{3 a^{2}}{4}$
C. $\frac{3 a^{2}}{4}$
D. $\frac{3 a^{2}}{4}$

Answer: Option B

Explanation:

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