+502 Calculate the radius of a circle whose area is equal to the sum of three circles of radii 2cm, 3cm, 4cm respectively.
+36915 Calculate the radius of a circle whose area is equal to the sum of the area of three circles of radii 2cm, 3cm, 4cm respectively.
(red letters added by me)
pi x r^2 = area of circle
pi x (2^2 + 3^2 + 4^2) = 91.106 cm^2
The circle radius we are looking for: pi x r^2 = 91.106 r = 5.385 cm
