Schoolyard 3158

The schoolyard is rectangular. Inside, a football field is 50 m long and 20 m wide. There is a 2 m wide racetrack around the course. How many meters does the fence measure around the entire schoolyard?

Correct answer:

x =  156 m

Step-by-step explanation:

$$\begin{gathered} a=50\text{m} \\ b=20\text{m} \\ c=2\text{m} \\ A=a+2\cdot c=50+2\cdot 2=54\text{m} \\ B=b+2\cdot c=20+2\cdot 2=24\text{m} \\ x=2\cdot (A+B)=2\cdot (54+24)=156\text{m} \end{gathered}$$

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