'`A B C D` is a rhombus and its diagonals intersect at `Odot` Is ` B O C\ ~= D O C ?`

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"`A B C D`
is a rhombus and its diagonals intersect at `Odot`

Is ` B O C\ ~= D O C ?`
State

the congruence condition used?
Also state, if ` B C O= D C O`"
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