Unknown 3rd side

Peter remembered that the sizes of all sides of the triangle, measured in meters, were whole numbers smaller than 10. Two sides were 3 m and 5 m long. However, he needed to remember the size of the third side. Can you help him? What was the size of the third side?

Final Answer:

c =  7 m

Step-by-step explanation:

$$\begin{gathered} a=3 \\ b=5 \\ a+b>c \\ a+c>a \\ b+c>a \\ 2<c<8 \\ c:3,4,5,6,7 \\ c=7=7\text{m} \end{gathered}$$

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