The circumference of a circle is equal to the sum of the circumferences of the two circles of di...

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The circumference of a circle is equal to the sum of the circumferences of the two circles of diameters 36 \( \mathrm{cm} \) and \( 20 \mathrm{~cm} \), the radius of that circle is
a. \( 56 \mathrm{~cm} \)
b. \( 18 \mathrm{~cm} \)
c. \( 28 \mathrm{~cm} \)
d. \( 16 \mathrm{~cm} \)
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