已知F 1 、F 2 是椭圆 x 2 16 + y 2 9 =1 的两焦点,过点F 2 的直线交椭圆于A、B两点,在△AF 1 B中,若有两边之和是10,则第三边的长度为( )
A.
6
B.
5
C.
4
D.
3
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