S=a*b ================

Question

S=a*b ================

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Answer 1

А.) S=ab=12*7=84см
б.) b=S/a=48:12=4см
в.) a=s/b=144:12=12см
г.) b=s/a=120:8=15см
P=2*(a+b)=2*(8+15)=46см