# Dog

Dog is tied to a chain, which is mounted in a corner of the yard. Yard has the shape of a square with a side length of 20 meters. The same long is also dogchain. Are there places in the yard where dog can't reach?

Result

#### Solution:

$u^2 = 20^2+20^2 \ \\ u = \sqrt 2 \cdot 20 = 28.284 \ m \ \\ u > a$

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