Question Number 78309 by otchereabdullai@gmail.com last updated on 15/Jan/20
Answered by mind is power last updated on 15/Jan/20
$$\angle\mathrm{BAO}=\angle\mathrm{OBA}=\mathrm{90}−\mathrm{x} \\ $$$$\angle\mathrm{BOA}=\mathrm{180}−\angle\mathrm{ABO}−\angle\mathrm{OAB}=\mathrm{180}−\left(\mathrm{90}−\mathrm{x}+\mathrm{90}−\mathrm{x}\right)=\mathrm{2x} \\ $$$$ \\ $$
Commented by otchereabdullai@gmail.com last updated on 16/Jan/20
$$\mathrm{thank}\:\mathrm{you}\:\mathrm{sir}\:\mathrm{power} \\ $$