т Пифагора
CD^2 =AC^2 -AD^2 =81-36 =45
BD =√(BC^2 -CD^2) =√(225-45) =√180 =6√5
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т Пифагора
CD^2 =AC^2 -AD^2 =81-36 =45
BD =√(BC^2 -CD^2) =√(225-45) =√180 =6√5