Question

ajutor va rogg !! urgentt
dau coroanaq​

Answer 1

<EDF+<DEF+<DFE=180° (intr un ∆ suma unghiurilor este 180°)

<DEF+<DFE=180°-<EDF

<DEF+<DFE=180°-72°

<DEF+<DFE=108°

<EIF+<IEF+<IFE=180°

<EIF+<DEF/2+<DFE/2=180°

<EIF+(<DEF+<DFE)/2=180°

<EIF+108°/2=180°

<EIF+54°=180°

<EIF=180°-54°

<EIF=126°