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A B D is a right triangle right-angle...

` A B D` is a right triangle right-angled at `A` and `A C_|_B D` . Show that `A B^2=B CdotB D` (ii) `A C^2=B CdotD C` (iii) `A D^2=B DdotC D` (iv) `(A B^2)/(A C^2)=(B D)/(D C)`

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