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Calculate the radius of a circle whose area is equal to the sum of three circles of radii 2cm, 3cm, 4cm respectively.

 Jan 6, 2017
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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

 Jan 6, 2017

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