Пошаговое объяснение:
1) C=2πR=πD=6cm*π=6π cm
2) C=2πR=94,2
R=94,2/(2π)=47,1/π=47,1/3,14=15
3) D1=8cm→R1=4cm R2=12cm
S1/S2=(πR1²)/(πR2²)=R1²/R2²=(R1/R2)²=(4/12)²=(1/3)²=1/9
S1/S2=1/9 или S2/S1=9
Пошаговое объяснение:
1) C=2πR=πD=6cm*π=6π cm
2) C=2πR=94,2
R=94,2/(2π)=47,1/π=47,1/3,14=15
3) D1=8cm→R1=4cm R2=12cm
S1/S2=(πR1²)/(πR2²)=R1²/R2²=(R1/R2)²=(4/12)²=(1/3)²=1/9
S1/S2=1/9 или S2/S1=9