1) площадь равна S=пD^2/4, D1= 6х2=12 см S1=3,14х12:^2/4=3,14х36=113,04 см2 D2=12х2=24 м S2= 3,14х24^2/4=3,14х144=452,16 м2 D3=3,5х2=7 см S3=3,14х7^2/4=38,465 см2 2) R=V(S/3,14) R1=V(314/3,14)=V100=10 м R2=V(12,56/3,14)=V4=2 м R3=V (78,5/3,14)=V25=5 cм
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1) площадь равна S=пD^2/4,D1= 6х2=12 см S1=3,14х12:^2/4=3,14х36=113,04 см2
D2=12х2=24 м S2= 3,14х24^2/4=3,14х144=452,16 м2
D3=3,5х2=7 см S3=3,14х7^2/4=38,465 см2
2) R=V(S/3,14)
R1=V(314/3,14)=V100=10 м
R2=V(12,56/3,14)=V4=2 м
R3=V (78,5/3,14)=V25=5 cм