The radius of a circle whose area is equal to the sum of the areas of the two circles of radii \...

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The radius of a circle whose area is equal to the sum of the areas of the two circles of radii \( 24 \mathrm{~cm} \) and 7 \( \mathrm{cm} \) respectively is
a. \( 18 \mathrm{~cm} \)
b. \( 25 \mathrm{~cm} \)
c. \( 12 \mathrm{~cm} \)
d. \( 32 \mathrm{~cm} \)
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