Sidewalk

In the garden, a 1-meter-wide sidewalk will be paved with tiles around the block-shaped pool. In the picture, the sidewalk is shown in gray. The dimensions of the bottom of the pool are 8.5 meters and 6 meters. The height of the pool walls is 2 meters.

How many m2 of pavement will be laid with tiles?

Correct result:

S =  33 m2

Solution:

s=1 m a=8.5 m b=6 m c=2 m  S1=a b=8.5 6=51 m2 S2=(a+2 s) (b+2 s)=(8.5+2 1) (6+2 1)=84  S=S2S1=8451=33 m2



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