Two circular pieces of equal radii and maximum area, touching each other are cut out from a rect...

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Two circular pieces of equal radii and maximum area, touching each other are cut out from a rectangular cardboard of dimensions \( 14 \mathrm{~cm} \times 7 \mathrm{~cm} \). The area of the remaining cardboard is
a. \( 19 \mathrm{~cm}^{2} \)
b. \( 20 \mathrm{~cm}^{2} \)
c. \( 21 \mathrm{~cm}^{2} \)
d. \( 22 \mathrm{~cm}^{2} \)
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