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In Figure, O is the mid point of A B and...

In Figure, `O` is the mid point of `A B` and `C D` . Prove that (i) `A O C~= B O D` (ii) AC=BD

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Let the smallest angle=`alpha`
Another angle=`2alpha`
Third angle=`3alpha`
In any triangle
Sum of angles=`180^@`
`alpha+2alpha+3alpha=180^@`
`6alpha=180^@`
`alpha=30^@`
...
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