Diameters of two circles are given as 10 cm and 24 cm. Radius of one circle =r1=5cm, Radius of other circle =r2=12cm According to the given information, Area of the larger circle =π(r1)2+π(r2)2 =π(5)2+π(12)2=π(13)2 ∴Radius of larger circle = 13 cm Hence, the diameter of larger circle = 26 cm