Question

find the sum of areas of 2 small circles of radii 8cm and15 cm is equal to area of big circle . find radius of big circle

Answer 1

the answer is 908.28571 sqcm because when we add the ares of the circle of radii of 8cm and the circle of radii of 15cm we get the area of the big circle

Answer 2

Area of first small circle = π*8²= 64π= 201.142 cm²
Area of second small circle= π*15²  = 707 .143 cm²  
Area of big circle= πR²=π(8²+15²)= 908.285 cm²
                       ⇒   R² = 289
                             R =17 cm
Radius of big circle is 17 cm