# What is the sum of the diameters of the two circles ?

There are two circles of radii r_{1} and r_{2} (r_{1}<r_{2}). The area of the bigger circle is 693/2 cm^{2}. The difference of their circumferences is 22 cm. What is the sum of the diameters of the two circles?

(a) 17.5 cm

(b) 22 cm

(c) 28.5 cm

(d) 35 cm