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Calculate the content of the shaded part of square with side 28 cm.

Correct result:

S =  168.248 cm2

#### Solution:

$a=28 \ \text{cm} \ \\ \ \\ S=a^{ 2 } - \pi \cdot \ (a/2)^{ 2 }=28^{ 2 } - 3.1416 \cdot \ (28/2)^{ 2 }=168.248 \ \text{cm}^2$

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