Question Number 177043 by Ar Brandon last updated on 30/Sep/22
Answered by a.lgnaoui last updated on 30/Sep/22
$$\left.\mathrm{A}\right){only}\:\mathrm{I} \\ $$
Commented by Rasheed.Sindhi last updated on 01/Oct/22
$$\left.{Why}\:{only}\:{you}?\::\right) \\ $$
Commented by a.lgnaoui last updated on 01/Oct/22
$$\left.{because}\:\:{sum}\left(\measuredangle{CKB},\measuredangle{B}'{AD}\right)\leqslant\mathrm{90}\left({CKB}\right){must}\:{be}\:\leqslant\mathrm{45}\right) \\ $$$${if}\:{CD}=\sqrt{\mathrm{3}}\:,{area}\left(\bigtriangleup{B}'{AD}\right)=\frac{\mathrm{3}}{\mathrm{4}} \\ $$