Second side

Calculate the length of the other side of the rectangle if its circumference is 60 cm and one side is 10 cm long.

Correct answer:

b =  20 cm

Step-by-step explanation:

$$\begin{gathered} o=60\text{ cm } \\ a=10\text{ cm } \\ 2(a+b)=o \\ 2(10+b)=60 \\ 2\cdot (10+b)=60 \\ 2b=40 \\ b=20\text{ cm} \end{gathered}$$

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