2a+2b=38
a+b=19 cm
a=b-3
b-3+b=19
2b=21 cm
b= 10,5 cm
a= 10,5 cm - 3
a= 7,5 cm
P=a*b
P= 10,5*7,5
P= 78,75 cm^2
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2a+2b=38
a+b=19 cm
a=b-3
b-3+b=19
2b=21 cm
b= 10,5 cm
a= 10,5 cm - 3
a= 7,5 cm
P=a*b
P= 10,5*7,5
P= 78,75 cm^2