Maths
This question was asked in Theorem 7.5

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Sonu Jais's image
Sonu Jais
Nov. 13, 2017, 8:38 a.m.

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P Roy
Jan. 9, 2018, 12:10 p.m.
since ABD & BDC are isotherm ...so AO orthogonal on BD & CO orthogonal on BD...hence angle OBA=60 ...so angle OAD=90-60=30
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