The diagonals of a rectangle A B C D\ ...

The diagonals of a rectangle `A B C D\ ` meet at `O` . If `/_B O C=44^@,` find `/_O A D`

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In rectangle `A B C D` diagonals meet at O.
in traingle `ADO`
`/_B O C=/_AOD=44^@` [vertically opposite angle]
`OA=OD`[diagonals of a rectangle are equal and bisects each other]
so `/_OAD=/_ODA`
now
`/_OAD+/_ODA+/_OAD=180^@`
`/_OAD+/_ODA=180^@-44^@`
`/_OAD=68^@`

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