Answer:
P rectangle = 2(8.5x-2+3.25x+1)= 2(11.75x-1)= 23,5x-2
P triangle = 2*4x+5,5x+3=13,5x+3
2 figures are the same perimeter
23.5x-2=13.5x+3
23.5x-13.5x=3+2
10x = 5
x=5/10 = 1/2 = 0.5
the value of x→0.5
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