Длина = 42-(10*2)/2=42-20*2=22*2=11 см
S=11*10=110 см2
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Длина = 42-(10*2)/2=42-20*2=22*2=11 см
S=11*10=110 см2
42-(2•10)=22
22:2=11
10•11=110
S=110