x-длина
3x/7-ширина
P=2(x+3x/7)=42
x+3x/7=21
(7x+3x)/7=21
10x=21*7
10x=147
x=14.7-длина
3x/7=3*14.7/7=6.3-ширина
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x-длина
3x/7-ширина
P=2(x+3x/7)=42
x+3x/7=21
(7x+3x)/7=21
10x=21*7
10x=147
x=14.7-длина
3x/7=3*14.7/7=6.3-ширина