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Question Number 138401 by Bekzod Jumayev last updated on 13/Apr/21

Commented by Bekzod Jumayev last updated on 13/Apr/21

Help?

$${Help}? \\ $$

Commented by Bekzod Jumayev last updated on 13/Apr/21

Please help?

$$\boldsymbol{{Please}}\:\boldsymbol{{help}}? \\ $$

Commented by mr W last updated on 13/Apr/21

∠EFD=90/2=45°=ϕ  ∠FDE=120/2=60°  ∠DEF=150/2=75°

$$\angle{EFD}=\mathrm{90}/\mathrm{2}=\mathrm{45}°=\varphi \\ $$$$\angle{FDE}=\mathrm{120}/\mathrm{2}=\mathrm{60}° \\ $$$$\angle{DEF}=\mathrm{150}/\mathrm{2}=\mathrm{75}° \\ $$

Commented by Bekzod Jumayev last updated on 13/Apr/21

Thank you sir!

$${Thank}\:{you}\:{sir}! \\ $$

Commented by mr W last updated on 15/Apr/21

general case see Q138519

$${general}\:{case}\:{see}\:{Q}\mathrm{138519} \\ $$

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