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∑ significa sumatoria de lados
(4x-1)+(4x-1)+(2x+3)+(2x+3) = 52
12x + 4 = 52
12x= 52-4
12x=48
x= 4
cuando nos dicen superficie ; se refieren al area :
area de un rectangulo = (base)(altura)
area= [4x-1][2x+3]
area = [4(4)-1][2(4)+3]
area= [16-1][8+3]
area=15(11)
area=165
espero se entienda xD