a=a0(1+ αt)=a0(1+200•20•10^-6)=a0(1+0,000200)=1,004a0
b=b0(1+ αt)=b0(1+200•20•10^-6)= 1,004b0
S=a•b=1,004a0•1,004b0=1,008a0b0=1,008a0b0=1,008a0b0•S0=
=1200•1,008=1209.619=1209,6 см кв
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a=a0(1+ αt)=a0(1+200•20•10^-6)=a0(1+0,000200)=1,004a0
b=b0(1+ αt)=b0(1+200•20•10^-6)= 1,004b0
S=a•b=1,004a0•1,004b0=1,008a0b0=1,008a0b0=1,008a0b0•S0=
=1200•1,008=1209.619=1209,6 см кв