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Sagot :
Answer:
57cm
Step-by-step explanation:
There are:
(width + length)*2= perimeter
<=> (51 + length)*2 = 216
<=> lenghth= (216/2) -51= 57
Answer:
57
Step-by-step explanation:
p=2(l+b)
216=2(l+51)cm
216/2=l+51
108=l+51
l=108-51
57
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