6.(2023•西宁一模)已知集合A={(x,y)∣x2+y2⩽2A=\{(x,y)\vert x^{2}+y^{2}\leqslant 2A={(x,y)∣x2+y2⩽2,x∈Nx\in Nx∈N,y∈N}y\in N\}y∈N},则AAA中元素的个数为((( )))