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In a ` A B C` , perpendicular `A D` from `A` on `B C` meets `B C` at `D` . If `B D=8c m` , `D C=2c m` and `A D=4c m` , then ` A B C` is isosceles (b) ` A B C` is equilateral (c) `A C=2\ A B` (d) ` A B C` is right-angled at `A` .

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