挑战习题
1/5单选题
难度:

1.刘英家的圆形镜子被打碎了,她拿了如图(网格中的每个小正方形边长为1)的一块碎片到玻璃店,配制成形状、大小与原来一致的镜面,则这个镜面的半径是(  )
A 2
B
C
D 3
提示1:
IOWcqOe9keagvOS4reaJvueCuUHjgIFC44CBRO+8iOWmguWbvu+8ie+8jOS9nEFC77yMQkTnmoTkuK3lnoLnur/vvIzkuqTngrlP5bCx5piv5ZyG5b+D77yM5pWFT0HljbPkuLrmraTlnIbnmoTljYrlvoTvvIzmoLnmja7li77ogqHlrprnkIbmsYLlh7pPQeeahOmVv+WNs+WPry4=
正确答案:Qg==
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