In Fig. 10.99, D E and D F are tan...

In Fig. 10.99, `D E` and `D F` are tangents from an external point `D` to a circle with centre `A` . If `D E=5c m` and `D E_|_D F` , then the radius of the circle is (FIGURE) (a) 3cm (b) 5cm (c) 4cm (d) 6cm

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