Răspuns:
Explicație pas cu pas:
26.
∡POQ=(∡AOD+∡BOE)/2+∡DOE
∡AOD+∡BOE=180°-∡DOE=180°-80°=100°
∡POQ=100°/2+80°=50°+80°=130°
27
∡BOQ=∡QOP=∡AOP=180°/3=60°
∡POD=∡POQ+(∡BOQ-∡DOB)=
= 60°+(60°-45°)=60°+15°=75°
∡QOD=60°-45°=15°
28
∡AOB+∡BOC=180°
2x-15+3x+25=180 5x+10=180 5x=170 x=34°
∡AOB=2x-15=2×34°-15=68° -15°=53°
∡BOC=180°-53°=127°
c)∡EOF=(∡AOB+∡BOC)/2=180°/2=90°
