S1=4πR1²
S2=4πR2²
S1∶S2=4πR1²∶4πR2²=R1²∶R2²=1∶2
∴R2=√2R1
V1=4π/3R1³
V2=4π/3R2³
V1∶V2=4π/3R1³∶4π/3R2³
=R1³∶R2³
=R1³∶(√2R1)³
=1∶(√2)³
=1∶2√2
∴V2∶V1=2√2
答:体积扩大为原来的2√2倍.
S1=4πR1²
S2=4πR2²
S1∶S2=4πR1²∶4πR2²=R1²∶R2²=1∶2
∴R2=√2R1
V1=4π/3R1³
V2=4π/3R2³
V1∶V2=4π/3R1³∶4π/3R2³
=R1³∶R2³
=R1³∶(√2R1)³
=1∶(√2)³
=1∶2√2
∴V2∶V1=2√2
答:体积扩大为原来的2√2倍.