Question Number 138401 by Bekzod Jumayev last updated on 13/Apr/21
Commented by Bekzod Jumayev last updated on 13/Apr/21
$${Help}? \\ $$
Commented by Bekzod Jumayev last updated on 13/Apr/21
$$\boldsymbol{{Please}}\:\boldsymbol{{help}}? \\ $$
Commented by mr W last updated on 13/Apr/21
$$\angle{EFD}=\mathrm{90}/\mathrm{2}=\mathrm{45}°=\varphi \\ $$$$\angle{FDE}=\mathrm{120}/\mathrm{2}=\mathrm{60}° \\ $$$$\angle{DEF}=\mathrm{150}/\mathrm{2}=\mathrm{75}° \\ $$
Commented by Bekzod Jumayev last updated on 13/Apr/21
$${Thank}\:{you}\:{sir}! \\ $$
Commented by mr W last updated on 15/Apr/21
$${general}\:{case}\:{see}\:{Q}\mathrm{138519} \\ $$