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In Fig. 10.78, if A D ,\ A E and B C...

In Fig. 10.78, if `A D ,\ A E` and `B C` are tangents to the circle at `D ,\ E` and `F` respectively. Then, (FIGURE) `A D=A B+B C+C A` (b) `2A D=A B+B C+C A` (c) `3A D=A B+B C+C A` (d) `4A D=A B+B C+C A`

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