Quadrilateral

The perimeter of a quadrilateral (four sided plane shape) is 125 cm . If the three known sides measure a=12 cm, b=45 cm, and c=30.5 cm, how long is the fourth side?

Correct result:

d =  37.5 cm

Solution:

$$\begin{gathered} o=125\text{ cm } \\ a=12\text{ cm } \\ b=45\text{ cm } \\ c=30.5\text{ cm } \\ a+b+c+d=o \\ d=o-a-b-c=125-12-45-30.5={\displaystyle \frac{75}{2}}=37{\displaystyle \frac{1}{2}}={\displaystyle \frac{75}{2}}\text{ cm}=37.5\text{ cm} \end{gathered}$$

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