Circumference 8137

One side of the rectangle is 8 cm long. When we enlarge the dimensions of this rectangle four times, we get a rectangle with a circumference of exactly 1m. How many mm does the other side of the unmagnified rectangle measure?

Correct answer:

b =  45 mm

Step-by-step explanation:

a=8 cm mm=8 10  mm=80 mm 2(4a+4b) = 1000  2(4 80+4b)=1000  2 (4 80+4 b)=1000  8b=360  b=8360=45  b=45=45 mm

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