\left. \begin{array} { l } { \qquad \left. \begin{array}{l}{ 0 \leq x \leq 8 \wedge 0 \leq y \leq 8 }\\{ \text { num referencial ortonormado } x o y , \text { é: } }\\{ \left. \begin{array} { l l } { \text { (A) } ( x - 4 ) ^ { 2 } + ( y - 4 ) ^ { 2 } = 16 } & { \text { (C) } ( x - 4 ) ^ { 2 } + ( y - 4 ) ^ { 2 } \leq 16 } \\ { \text { (B) } ( x - 4 ) ^ { 2 } + ( y - 4 ) ^ { 2 } = 64 } & { \text { (D) } x ^ { 2 } + ( y - 4 ) ^ { 2 } = 16 } \end{array} \right. }\end{array} \right. } \end{array} \right.
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