the area enclosed by between the circumference of 2 concentric circle is 16πsqcm and their radii are are in the ratio 5:3.What is the area of the outer circle? use π=3.14
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let the radii be 5x and 3x,
hence,
pi 25x^2-pi 9x^2=16 pi
pi x^2(25-9)=16 pi
x^2 =1
hence x=1
so the area of outer circle is ,
3.14×5×5
=314/4=78.5 sqcm
hence,
pi 25x^2-pi 9x^2=16 pi
pi x^2(25-9)=16 pi
x^2 =1
hence x=1
so the area of outer circle is ,
3.14×5×5
=314/4=78.5 sqcm
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