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A B C D is a square. A C\ a n d\ B D int...

`A B C D` is a square. `A C\ a n d\ B D` intersect at `Odot` State the measure of `/_A O B`

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In `sqaure ABCD`, The diagonal AC bisects the `/_DCB \and\ /_BAD.`
Also, the diagonal BD bisects `/_ADC and /_ABC`
`m(∠OAB)=90^0/2=45^0`
`m(/_OBA)=90^0=45^0`
In `/_\AOB, m(/_AOB)+m(/_OAB)+m(/_OBA)=180^0`
`=>m(∠AOB)+45^0+45^0=180^0`
`m(/_AOB)=90^0`
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