Fence and scale

The garden with 80 m of fencing is draw on plan as a square with a side length of 4 cm. At what scale is this plan made?

Result

M = (Correct answer is: 1/500) Wrong answer

Solution:

o=80 m a2=4/100=125=0.04 m o2=4⋅ a2=4⋅ 0.04=425=0.16 m m=o/o2=80/0.16=500 M=1:500o=80 \ \text{m} \ \\ a_{2}=4/100=\dfrac{ 1 }{ 25 }=0.04 \ \text{m} \ \\ o_{2}=4 \cdot \ a_{2}=4 \cdot \ 0.04=\dfrac{ 4 }{ 25 }=0.16 \ \text{m} \ \\ m=o/o_{2}=80/0.16=500 \ \\ M=1:500

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