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The ratio of the area of a circle, P , to the area of another circle, Q , is 16/81 .

If the radius of circle P is 8 units, what is the radius of circle Q ?

Respuesta :

ratio of  the radii = sqrt16 / sqrt81 = 4/9

so radius of circle Q  is  found by solving  4/9 = 8/x  where x = radius of Q

x = 2*9  = 18

radius of circle Q = 18.

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