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A B and C D are two common tangents t...

`A B` and `C D` are two common tangents to circles which touch each other at `C` . If `D` lies on `A B` such that `C D` =4cm, then `A B` is equal to (a) 4cm (b) 6cm (c) 8cm (d) 12cm

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RD SHARMA-CIRCLES-All Questions
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