# Floor

The floor area of ​​the room is 31 m2 and has a width of 4.3 m. How many centimeters of circumference measured floor on the map at the scale 1:75?

Correct result:

o =  30.7 cm

#### Solution:

$o = 2(a+b)\cdot \dfrac{100}{ 75} = 2(a + \dfrac{ S}{a}) \cdot \dfrac{100}{ 75} = \ \\ o = ( 4.3 + \dfrac{ 31}{ 4.3}) \cdot \dfrac{200}{ 75} = 30.7 \ \text{cm}$

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