質問: 44.2 _ _ _ _ _ _ _ _ _ _ _Процесс решения показать тоже ! =====================================================================
回答: S=πR2 1)R=2 , S=πR2=3.14×4=12.56 2)R=5, S=πR2=3.14×25=78.5 3)S=9, R= √S÷π=√9÷3.14≈√2.9≈1.7 4)R=2÷7, S=πR2=3.14×4÷49≈0.7 5)S=49π, R=√S÷π=√49π÷π=√49=7 6)R=54.3, S=πR2=3.14×2948.49≈9258 7)S=√3, R=√S÷π=√√3÷3.14≈√0.6≈0.8 8)R=6.25, S=πR2=3.14×39.0625=≈122.7