Пошаговое объяснение:
Formula S=πR²
Half circle formula S=1/2*π*R²
Sbmo=π*MO²/2=3*2²/2=3*4/2=12/2=6 cm²
Sboa=π*OA²/2=3*4²/2=3*16/2=48/2=24 cm²
S(blue)=Sboa-Sbmo=24-6=18 cm²
Answer: blue Square 18cm²
Full blue circle 18*2=36 cm²
