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In the Figure, O D is perpendicular to ...

In the Figure, `O D` is perpendicular to the chord `A B` of a circle whose centre is `Odot` If `B C` is a diameter, show that `C A=2 OD`

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`OD_|_AB`
D is mid point of AB
BC is diameter
O is the midpoint of BC
BD=`1/2`AC
AC=2*DB.
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